Kilmarnock (/kɪlˈmɑːrnək/ kil-MAR-nək; Scots: Kilmaurnock; Scottish Gaelic: Cill Mheàrnaig, IPA: [kʲʰiːʎ ˈvaːɾnəkʲ]) is a town and former burgh in East Ayrshire situated in southwest Scotland. The town has served as the administrative centre of East Ayrshire Council since 1996 and is the region's main commercial and industrial centre.

The town grew considerably during the 1870s and the town's growth subsumed the village of Bonnyton, and by the 1960s, new purpose built suburbs such as New Farm Loch were constructed to accommodate the increasing population of Kilmarnock. By mid–2020, the population of the town was estimated to be 46,970, making Kilmarnock the 14th most populated settlement in Scotland as well as the largest town in Ayrshire by population.

The first passenger conveying railway in Scotland originated in Kilmarnock in 1812 as a horse-drawn 4 ft-gauge plateway and became known as the Kilmarnock and Troon Railway. The first printed collection of works by Scottish poet Robert Burns was published in 1786 in Kilmarnock. Poems, Chiefly in the Scottish Dialect, was published by John Wilson, and became known as the Kilmarnock Edition. The internationally best–selling whisky Johnnie Walker was established in the town in the 19th century and was produced and bottled at the Hill Street plant until closure in 2012, following an announcement by owners Diageo in 2009 that the plant would close as part of company restructuring.

The name Kilmarnock comes from the Gaelic cill (cell), and the name of Saint Marnock or Mernoc who is also remembered in the name of Portmarnock in Ireland and Inchmarnock. It may come from the three Gaelic elements mo, 'my', Ernán (name of the saint) and the diminutive ag, giving Church of My Little Ernán. According to tradition, the saint founded a church there in the 7th century. The name Kilmarnock literally means "Marnock's Church". There are 12 Church of Scotland congregations in the town, plus other denominations. In 2005, the Reverend David W. Lacy, minister of the town's Henderson Church, was elected Moderator of the General Assembly of the Church of Scotland.

The town's precise origins are largely unclear, however, it is believed that a community was established between the fifth–seventh centuries at the Laigh Kirk Church by a Saint Marnock. The earliest known mention of the town was in the 14th century, with Clan Boyd coming to prominence in the area during that time, building the Keep of the Dean Castle. The Romans held a "tentative grip" on the area in and around Kilmarnock, with forts nearby at Loudoun Castle as well as possessing costal harbours around Ayrshire. Early references to the town are vague in regards to population numbers and the geographical size of the town, however, it is widely believed that at this time, the town was little more than a small cluster of dwellings situated around the Laigh Kirk church.

By the end of the sixteenth century, Kilmarnock had become a burgh of barony, and had a weekly market stall and by the 1600s had grown into a small network of narrow streets, with the population relying on industries such as spinning wool, knitting bonnets and the manufacturing of metal cutlery to make a living. A fire engulfed the town in 1668, following the hunting of Covenanters by government troops.

The core of the early town appears to have lain around what is now the Laigh Kirk, Kilmarnock (Low Church), although the oldest parts of the current building are no earlier than the 17th century, extending north and northwest. In 1668 the town was largely destroyed by an accidental fire. About 120 families lost most of their possessions and were forced to live destitute in the fields surrounding the town. These tradespeople had no other way of making a living and had already been driven to the edge of poverty by having troops stationed with them as part of the anti-Covenanter measures. Parish churches throughout Scotland collected money for the relief of these homeless citizens.

In 1592, King James VI of Scotland granted a charter to Thomas, Lord Boyd, erecting Kilmarnock into a burgh of barony. The charter confirms that the Boyd family to be in possession of the land of Kilmarnock and assures any future line of succession. At the beginning of the 16th century, Kilmarnock was described as "a large village and of great repair" with nearby Kilmaurs notably larger than Kilmarnock. However, over the course of the next one hundred years, the expansion of Kilmarnock was evident. Its expansion led to Kilmarnock becoming larger than Kilmaurs and becoming Ayrshire's largest inland centre and challenging the supremacy of the royal burghs of Ayr and Irvine. During the 19th century, due to the growing rate of expansion due to the industrial expansion, Kilmarnock's population growth increased significantly from 6,000 in 1800, 21,000 in 1851 and 35,000 by 1901.

In the early nineteenth century, Kilmarnock was developed considerably, with the town improvement committee creating plans to improve the road network around the town as they considered the narrow streets that had been in place at the time to be a hindrance for potential trade and development. Plans for new grid-based streets were developed following the consideration of the town improvement committee which resulted in thoroughfares through King Street, Titchfield Street, John Finnie Street and surrounding roadways. The full planned course of the development were never fully completed, resulting in many of the towns older streets and lanes within the new grid-based developments, including Bank Street, Croft Street and Nelson Street not being redeveloped. The refurbished streets were lined with commercial properties, and John Finnie Street is considered one of the most complete examples of Victorian architecture in Scotland.

Although never granted the title of royal burgh, largely due to its geography as an inland settlement with no port to enhance trade at sea, Kilmarnock, as a parliamentary burgh was ranked as equal to other nearby royal burghs such as Ayr and Irvine. Its close proximity to Troon and its harbour helped Kilmarnock's trade and economy and its reputation of a strong and important burgh despite its inland position. Goods such as coal were frequently transported from Kilmarnock to Troon for export, and by 1812 a new railway line between Kilmarnock and Troon was constructed to allow trade to flow from the town much easier. The line opened in 1812, and was the first railway in Scotland to obtain an authorising Act of Parliament; it would soon also become the first railway in Scotland to use a steam locomotive; the first to carry passengers; and the River Irvine bridge, Laigh Milton Viaduct, is the earliest railway viaduct in Scotland. It was a plateway, using L-shaped iron plates as rails, to carry wagons with flangeless wheels. In 1841, when more modern railways had developed throughout the West of Scotland, the line was converted from a plateway to a railway and realigned in places. The line became part of the Glasgow and South Western Railway system. Much of the original route is part of the present-day Kilmarnock to Barassie railway line, although the extremities of the original line have been lost.

When elected county councils were created in 1890 under the Local Government (Scotland) Act 1889, the burgh of Kilmarnock was deemed capable of running its own affairs and so was excluded from the jurisdiction of Ayrshire County Council. Further local government reform in 1930 brought the burgh within the area controlled by Ayrshire County Council, but classed as a large burgh, which allowed the town to continue to run many local services itself. Kilmarnock Town Council was based at the Town Hall at 28 King Street, which was built in 1805 and demolished in the 1970s.

The growth of Kilmarnock in population and geographical area swallowed up the old separate village communities of Beansburn, Bonnyton, and Riccarton. This led to such communities and villages around the town losing their identities due to the process of rehousing people who were dispersed to the new housing schemes. These large new housing areas lacked adequate shopping and recreational facilities, and most of them were not within convenient walking distance of the old town centre. Despite the growth in population of Kilmarnock, the town did not grow in terms of proportion, and construction of new building took place mostly on "gap sites", the construction of houses at Robertson Place by the Kilmarnock Building Company, being an exception.

This expansion led to the town becoming a major centre in the west of Scotland. By 1856, Kilmarnock was widely regarded as a key railway location when the Glasgow and South Western Railway re-located their workshops from Cook Street in Glasgow to Bonnyton. Homes were constructed for the workers of the Glasgow & South Western Railway Company at Bonnyton Square and at other areas in Bonnyton. These houses were later demolished in 1966 and 1967.

A comparatively modest settlement until the Industrial Revolution, Kilmarnock extended considerably from around 1800 onwards, requiring the opening of King Street, Portland Street, and Wellington Street. Added later was John Finnie Street, which is regarded as "one of the finest Victorian planned streets in Scotland." The Sandbed Street Bridge is the oldest known surviving bridge in the area.

During the 19th century, the traditional cottage crafts in the town which had been "around for generations", expanded and grew into major industries. A number of Kilmarnock industries established both national and international reputations, such as leather makers who were sought to make items such as belts, saddles and other leather goods. Boots and shoes began to dominate the leather making industry in the town, and by 1837, local shoemakers were making in excess of 2,400 pairs of shoes and boots. In 1840, George Clark's shoe making company, established and based in the town, began exporting shoes to Brazil, using the merchant venture system which was created to allow producers to make use of any spare space on cargo ships. It is widely believed that Clark used cargo ships mostly carrying Kilmarnock whisky exports, and as a result, both Kilmarnock whisky and shoe made products became widely popular in Brazil. The shoe production business continued to grow, and by 1900, Clark's shoe business, Saxone, had a total of 40 shop premises in Brazil.

Additionally, Kilmarnock gained a reputation of being a location for quality carpet making, following Charlotte Maria Gardiner, half auntie of the 4th Earl of Kilmarnock, bringing a number of carpet makers from Dalkeith to Kilmarnock. BMK Carpets was founded in Kilmarnock in 1908, quickly earning a reputation for the top carpet manufacturer of choice for major venues. It remained Kilmarnock's main employer until closure in 2005. Glenfield and Kennedy became the largest company of hydraulic engineers in the British Empire. All three companies – BMK Carpets, Saxone Shoes and Glenfield and Kennedy, became widely known and trusted in export markets internationally. Johnnie Walker whisky, established as a grocery shop in 1820, was transformed into a global whisky brand, and is the world's best selling brand of whisky. The Titchfield Street drill hall was completed in 1914.

The Kilmarnock War Memorial was constructed in temple style and completed in 1927, becoming dedicated to local men who died "for king and country" during World War I. Following World War II, more plaques were added to the war memorial to commemorate local men who died during World War II, and later, plaques to commemorate those who fought in the Korean War were added.The first post–war housing scheme in Kilmarnock, at Shortlees, was completed by the 1960s, followed by Bellfield by the end of the decade.

Following the second World War, many of the towns factories and production sites had to be transformed into meeting civil needs, rather than those needs of the military, as had been expected during the war effort. A considerable effort began to construct "homes for heroes" in Kilmarnock following World War II, taking "years, even decades, to complete". New companies opened in Kilmarnock by the late 1940s and early 1950s, such as Glacier Metal Massey–Harris. The first post–war housing scheme in Kilmarnock, at Shortlees, was completed by the 1960s, followed by Bellfield by the end of the decade.

During World War II, a local battalion of the Home Guard was established in the town to protect the area during the war. The Kilmarnock Guard was known as the 4th North Kyle Home Guard, with men from Kilmarnock, Galston, Newmilns, Darvel, Hurlford, Fenwick and Craigie part of the battalion. The battalion was commanded by Lieutenant-Colonel D.M. Wilkie, with F. Richmond Paton as second in command, and Major Hugh B. Farrar as adjutant.

Kilmarnock based carpet manufacturing company BMK ceased production of carpets for a time during the second world war to manufacture bomb shells for the war effort. Glenfild & Kennedy, also based in the town, made components for anti-tank guns among other war-related engineering projects, including valves for mulberry harbours. Local mansions around the town were requisitioned, such as Bellfield House, with many becoming operational bases for training Special Air Services personnel. Kilmarnock Swimming Baths were also used for this purpose. The town's prominent cooling towers were painted in camouflage to prevent them being visible to the German Luftwaffe.

The town suffered one air raid attack by the Luftwaffe, which killed four people on 6 May 1943. The Luftwaffe dropped a total of fourteen bombs in a line, from South Dean Farm to Kilmarnock cemetery. A 50 kg bomb landed on a block of four residential houses in the towns Culzean Crescent, killing four residents; Janet MacGeachie, Alice MacGeachie, John Bissett and Dorothy Armour.

In 1945 an attempt by the Burgh Council of Kilmarnock to cope with increasing traffic was made by removing the statue of Sir James Shaw and re-developing the Cross into a roundabout. In 1976, a one-way traffic system was introduced around the town centre which is still in use today as of December 2023, however, that same month, it was confirmed that studies were being conducted which would see the town centre converted back to a two way street for traffic. Considerable growth of the town occurred in the second half of the 19th century, and following World War I, major efforts began to construct new homes to be "fit for heroes". New residential and commercial streets around the town were created, with large housing schemes being built in the years which followed the end of World War II. The first new housing estate in Kilmarnock following World War II would become Shortlees, followed by the Grange Estate, Bellfield and Onthank during the 1960s. During this period, the priority continued to be on the construction of council housing, however, there was still a demand for houses in the private market, and with that, the construction of the Grange Estate would push the boundary of Kilmarnock's built up area.

Despite the new housing estates at Shortlees, Bellfield, Grange and Onthank, housing demand continued to be strong, and the construction of additional housing estates continued through the late 1960s and early 1970s. Mass housing construction to create the New Farm Loch estate aimed to meet the increased demands of the towns population by providing additional space for homes as well as vehicles. More land was allocated than in previous house building projects to meet these demands. A 1923 Act of Parliament granted the construction of new homes at Scott Roads Fulton's Lane, Townholm and Landmark. Additional acts of Parliament in 1924 and 1925 allowed the commencement of construction of additional homes at Annanhill, Ayr Road, Bonnyton, Craigie Road, Granger Road, London Road, Longpark, New Mill Road, New Street, Stoneyhill Avenue and Yorke Place. By 1973, an outer-town bypass was formed to take away the heavy through traffic that had been travelling in and throughout the town. In 1974, the Foregate pedestrianised shopping area was opened, to be followed by a new bus station, a multistorey car park, a civic centre, and a re-shaped central precinct for the town.

The textile and manufacturing sectors across Scotland suffered significant decline in the post-war period and in particular from the 1960s, in the face of greater foreign competition. Kilmarnock was no exception, with the closure or significant reduction of many of its traditional large employers: Glenfield and Kennedy, Massey Ferguson, BMK and Saxone. Although significant attempts have been made to halt this decline and attract new employers, Kilmarnock saw a continuing net loss of jobs in the five years to 2005. Although traditionally a main shopping area for most of the surrounding districts, patterns have changed over the last 20 years; traditional centres such as Ayr have been joined by new developments at Braehead and East Kilbride. This difficult economic climate is most visible in the town centre, the eastern part of which has been extensively redeveloped, with important historic buildings such as King Street Church and the town hall being demolished and Duke Street (the link from Kilmarnock Cross to the Palace Theatre and out to the London Road) built over.

In 1996 the two-tier system of regions and districts was abolished and Ayrshire was divided between the unitary council areas of East Ayrshire (covering the area of the former Kilmarnock & Loudoun District and Cumnock & Doon Valley District), North Ayrshire (covering the area of the former Cunninghame District Council) and South Ayrshire (covering the area of the former Kyle and Carrick District).

Following this, Kilmarnock now came under East Ayrshire Council which was formed in April 1995 to replace the Kilmarnock and Loudoun and Cumnock and Doon Valley District Councils, and the part of Strathclyde Regional Council which related to the area. The newly formed East Ayrshire Council were granted responsibility for areas such as education, social work, leisure and planning, among other services, for Kilmarnock and the wider East Ayrshire geographical area.

Kilmarnock became the administrative centre for the newly formed East Ayrshire Council, with the council purchasing the former James Hamilton Academy building on London Road for £1. The building was refurbished and has since been the meeting place for elected councillors, the cabinet of East Ayrshire Council and is the main seat for the Chief Executive of East Ayrshire Council, the provost of East Ayrshire and Depute Provost of East Ayrshire

In 2004, the Rough Guide to Scotland described the town as "shabby and depressed, saddled with some terrible shopping centres and a grim one-way system". In early 2006, an application to Historic Scotland's Conservation Area Regeneration Scheme was successful, and in July 2006 an application under the Heritage Lottery Fund's Townscape Heritage Initiative Scheme was pending, allowing work to be finished on a quality housing development on the site of the former Kilmarnock Infirmary, north of the town centre, which was completed by local property development company The KLIN Group. With a journey time of 20 minutes from Kilmarnock to Glasgow, the M77 motorway received an extensive upgrade in 2005 to accommodate Kilmarnock's emerging status as a commuter town. As a result, new quality housing has been constructed on the northern fringes of the town for commuters to Glasgow and the central belt of Scotland. Recent house price in and around Kilmarnock have reflected the towns location for commuters to the country's largest city.

In 2015, Kilmarnock was named 'Scotland's Most Improved Town' at the Scottish Urban Regeneration Forum awards. The panel recognised the improvements made to the town centre of Kilmarnock due to a £43 million investment, and local authority intervention to restore derelict buildings including the former Johnnie Walker bond building and the Opera House. In April 2018, East Ayrshire Council published a plan to protect and enhance the towns historic and listed buildings. Structures such as the former ABC cinema (previously the King's Theatre) on Titchfield Street has lay derelict since the opening of the Odeon cinema at Queens Drive. Buildings such as this are considered to be irreplaceable listed buildings. East Ayrshire Council has committed to regenerating the town, with buildings such as the former Opera House on John Finnie Street which was destroyed by fire in the late 1980s, being reconstructed with its original facade retained and is now office space for East Ayrshire Council.

The end of the 20th century and the beginning of the 21st century is widely regarded as a "boom period" for housing construction in Kilmarnock. Large numbers of farm land was purchased by housing developers, with an "unprecedented" number of houses being completed, notably at Southcraig, Dunsmuir Park and the Johnnie Walker estate. The largest house building projects in Kilmarnock were undertaken at Southcraig and Dunsmuir Park.