Hornsby Shire is a local government area situated on the Upper North Shore as well as parts of the Hills District, of Sydney in the state of New South Wales, Australia. The shire stretches from the M2 Hills Motorway in the south to the Hawkesbury River town of Wisemans Ferry, some 53 kilometres (33 mi) to the north, making it the largest local government council in the Greater Sydney Metropolitan region by total area. As of the 2016 census the shire had an estimated population of 142,667.

The mayor of Hornsby Shire is Cr Warren Waddell, a member of the Liberal Party, who was elected on 14 September 2024.

Suburbs in the Hornsby Shire include:

Towns and localities in the Hornsby Shire are:

At the 2016 census, there were 142,667 people in the Hornsby local government area, of these 48.8 per cent were male and 51.2 per cent were female. Aboriginal and Torres Strait Islander people made up 0.5 per cent of the population; significantly below the NSW and Australian averages of 2.9 and 2.8 per cent respectively. The median age of people in the Hornsby Shire was 40 years; slightly higher than the national median of 38 years. Children aged 0 – 14 years made up 19.5 per cent of the population and people aged 65 years and over made up 16.2 per cent of the population. Of people in the area aged 15 years and over, 58.8 per cent were married and 8.2 per cent were either divorced or separated.

Population growth in the Hornsby Shire between the 2001 census and the 2006 census was 4.58 per cent and in the subsequent five years to the 2011 census, population growth was 3.65 per cent. At the 2016 census, the population in the Shire decreased by 9.04 per cent brought about predominately by an adjustment in local government boundaries. The median weekly income for residents within the Hornsby Shire was higher than the national average. As of the 2021 Census, reflecting a national change in opinion towards religion, the amount of non-religious people increased to 36.0% from 28.9% recorded at the previous Census in 2016.

Selected historical census data for Hornsby local government area
Census year			2001	2006	2011	2016	2021
Population		Estimated residents on census night	144,692	151,325	156,847	142,667	151,811
		LGA rank in terms of size within New South Wales			16th	20th
		% of New South Wales population			2.27%	1.91%
		% of Australian population	0.77%	0.76%	0.73%	0.61%
Cultural and language diversity
Ancestry, top responses		English			23.5%	22.8%	27.6%
		Australian			22.4%	19.7%	24.4%
		Chinese			9.8%	10.6%	16.8%
		Irish			7.1%	7.3%	7.8%
		Scottish			6.3%	6.2%	7.8%
Language, top responses (other than English)		Mandarin	2.0%	3.5%	4.9%	7.2%	9.2%
		Cantonese	4.6%	5.1%	5.2%	4.0%	4.1%
		Korean	1.6%	2.1%	2.7%	2.3%	2.3%
		Hindi	0.7%	1.1%	1.5%	1.6%	2.2%
		Persian (excluding Dari)	n/c	n/c	n/c	1.2%	1.4%
Religious affiliation
Religious affiliation, top responses		No religion, so described	14.0%	17.1%	21.9%	28.9%	36.0%
		Catholic	24.6%	24.3%	23.6%	21.4%	19.2%
		Anglican	23.4%	21.3%	19.0%	15.5%	12.2%
		Not stated	n/c	n/c	n/c	7.3%	4.2%
		Hinduism	1.8%	2.5%	3.5%	4.6%	6.7%
Median weekly incomes
Personal income		Median weekly personal income		$580	$682	$793	$958
		% of Australian median income		124.5%	118.2%	119.8%
Family income		Median weekly family income		$1,514	$2,119	$2,372	$2,825
		% of Australian median income		147.4%	143.1%	136.8%
Household income		Median weekly household income		$1,763	$1,824	$2,121	$2,417
		% of Australian median income		150.5%	147.8%	147.5%

Hornsby Shire Council is composed of ten councillors, including the mayor, for a fixed four-year term of office. The mayor is directly elected while the nine other councillors are elected proportionally as three separate wards, each electing three councillors. The most recent election was held on 4 December 2021, and the makeup of the council, including the mayor, is as follows:

Party		Councillors
	Liberal	5
	Greens	2
	Labor	2
	Independent Liberal	1
	Total	10

The current Council, elected in 2024, in order of election by ward, is:

Ward	Councillor		Party	Notes
Mayor		Warren Waddell	Liberal
A Ward		Jane Seaglove	Liberal
		Nathan Tilbury	Independent Liberal	Resigned from Liberal Party in 2024
		Olivia Simons	Greens
B Ward		Janelle McIntosh	Labor
		Sallianne McClelland	Liberal
		Monika Ball	Greens
C Ward		Verity Greenwood	Liberal
		Ben McSweeney	Liberal
		Matthew Conley	Labor

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Hornsby Shire is the traditional lands occupied by the Darug and Kuringgai peoples of indigenous Australians. While the northern part of the Shire via the Hawkesbury River was visited by the first European settlers in late 1788, due to the Shire's rugged landscape permanent European settlement did not begin until almost half a century later.

Hornsby Shire got its name from the town of Hornsby at the eastern end of the Shire, is derived from convict-turned-Constable Samuel Horne, who earned distinction by capturing bushrangers Dalton and MacNamara on 22 June 1830. In return he was granted land in the locality known as "Hornsby Place".

Hornsby Shire has remained largely rural for many decades. The construction of the Main North railway line in the 1880s opened up the Shire to the rest of Sydney and also to Newcastle, but it was not until motor vehicles became commonplace in the 1950s that the southern part of the Shire truly became part of Sydney's suburbia. The Shire was incorporated as a local government authority on 6 March 1906.

A 2015 review of local government boundaries by the NSW Government Independent Pricing and Regulatory Tribunal recommended that Hornsby Shire merge with adjoining councils. The government considered two proposals. The first proposed a merger of part of Hornsby with the Ku-ring-gai Council to form a new council with an area of 540 square kilometres (210 sq mi) and support a population of approximately 270,000. The second proposed a merger of parts of Parramatta, Auburn, The Hills, Hornsby, and Holroyd to form a new council with an area of 82 square kilometres (32 sq mi) and support a population of approximately 215,725. The outcome of the review was that the suburbs of Hornsby Shire Council south of the M2 joined an expanded Parramatta City Council. The NSW Government also gave in principle support for the Hornsby Shire suburbs north of the M2 to amalgamate with Ku-ring-gai Council. In July 2017, the Berejiklian government decided to abandon the forced merger of the Hornsby and Ku-ring-gai local government areas, along with several other proposed forced mergers. This failed merger resulted in the council losing lucrative area south of the M2 including Epping and Carlingford.

The Hornsby Shire has a number of heritage-listed sites, including:

• Brooklyn, Main Northern railway: Hawkesbury River railway station
• Cheltenham, 67 Cobran Road: Ahimsa, Cheltenham
• Galston, 161 Main Road: Tunks Creek Bridge
• Galston, 11 School Road: Galston Congregational Church Pipe Organ
• Hornsby, 2a Manor Road (Rosamond Street): Mount Wilga House
• Hornsby, Old Man's Valley, off Quarry Road: Old Man's Valley Cemetery
• Normanhurst, 82-84 Pennant Hills Road: Gilligaloola
• Wahroonga, 9 Highlands Avenue: Highlands

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Hornsby calls itself the 'Bushland Shire'. This is in reference to its location on a high ridge separating two expansive areas of natural bushland which consists of up to 70% of the total area: The Ku-ring-gai Chase National Park on the eastern side and the Berowra Valley Regional Park on the western side. These provide large areas of natural parkland that form a green belt running from Sydney at the south to the Hawkesbury River at the Shire's northern end. These parks are extremely popular with day-trippers from all areas of Sydney and provides diverse recreations such as bushwalking and boating.

The northern half of Hornsby Shire remains a semi-rural area, retaining a number of farmlands and market gardens. This area consists of small village settlements such as Mount Colah and Hornsby Heights. The village of Galston is the centre of this rural area.

The western part of the shire shares a 53-kilometre (33 mi) border with The Hills Shire and is separated from the rest of the Shire by national parks and the Galston Gorge.

The southern half of the Shire is urban, forming part of Sydney's suburbia on the North Shore and Northern Suburbs. Traditionally most of the Shire's residents live in free-standing houses, but in recent years a number of semi-detached housings as well as high-density apartments have appeared around Hornsby's central business district.

The Shire has several areas with industrial activity including Hornsby, Asquith and Thornleigh. The major commercial centres of the Shire, apart from Hornsby's central business district, are the suburbs of Pennant Hills and North Epping.

Local attractions in the Hornsby Shire include its easily accessible wilderness areas including part of the Great North Walk, parkland recreational facilities such as Fagan Park at Galston, Pennant Hills Park, Koala Park Sanctuary in West Pennant Hills, and the village of Brooklyn on the Hawkesbury River.

Hornsby Shire has four public libraries (at Hornsby, Pennant Hills, Berowra and Galston, two public swimming pools ("aquatic centres"), and a range of other sporting and community facilities.

The most popular sport in the Hornsby Shire is Rugby Union, and the main team in the areas is the Hornsby Rugby Club, who play at Mark Taylor Oval in Waitara. Hornsby Shire is home to Barker College, a traditional Rugby Union school

Due to geographical Junior Districts, Hornsby Shire is represented in Rugby League by the North Sydney Bears. The North Sydney District Rugby League Football Club, as they are officially known by, are the only team without NRL representation to have a Junior Rugby League District, and teams in the District compete in a Joint District with the Manly, Pittwater and Warringah districts, and clubs are identified with either the Bears or Sea Eagles by which teams logo is on their jersey, with Manly, Pittwater and Warringah districts affiliated with Manly, and teams in the North Sydney district affiliated with the Bears. Hornsby Shire has 4 Junior Rugby League teams, the Asquith Magpies, the Berowra Wallabies, the Hills Hawks (Based in Dural) Pennant Hills-Cherrybrook Stags, all which are in North Sydney’s District

• Local government areas of New South Wales

• Hornsby Shire website
• Joan Rowland (2011). "Hornsby Shire". Dictionary of Sydney. Retrieved 27 September 2015. [CC-By-SA]