Aligarh (Hindi pronunciation: [əliːgəɽʱ]; formerly known as Koil) is a city in the state of Uttar Pradesh in India. It is the administrative headquarters of Aligarh district, and lies 342 kilometres (213 mi) northwest of state capital Lucknow and approximately 130 kilometres (81 mi) southeast of the capital, New Delhi. The cities and districts which adjoin Aligarh are: Gautam Buddha Nagar, Bulandshahr, Sambhal, Badaun, Kasganj, Hathras, Etah and Mathura, as well as Palwal district of Haryana. As of 2011, Aligarh is the 53rd most populous city in India.

The recorded history of Aligarh begins in the 12th century, under the name Kol. Kol was a major city of the Delhi Sultanate and Mughal Empire, serving as both a political and economic centre. Beginning with a major rebuilding of the Aligarh Fort in the 16th century, the city was renamed several times before eventually settling on the current name, Aligarh, in the mid-1700s. It is notable as the seat of Aligarh Muslim University, which was founded here as Mohammadan Anglo-Oriental College in 1875, initiating the Aligarh Movement.

Written references to the city commence only from 12th century onward; however, archaeological records suggest that the town used to be inhabited by Jains. The area of Aligarh before the Ghurid conquest of the region was under the sway of Dor Rajputs in 12th century.

In 1194, Qutb-ud-din Aibak mounted a successful invasion of the region and Hisam-ud-din Ulbak was installed as the first Muslim governor; court-historian Hasan Nizami noted Kol to be "one of the most celebrated fortresses of Hind". Beginning the 13th century, the place featured — as Kol or Koil — in multiple Persian (as well as non-Persian) Sultanate sources as a center of economic prominence, especially for production of distilled wine. By the mid-13th century, the town commanded enough importance for (would-be Sultan) Ghiyas ud din Balban to erect a minaret.

Under the Khiljis and Tughlaqs, the prominence continued unabated; it had become an iqta by the times of Alauddin Khalji.

Kol is mentioned in Ibn Battuta's Rihla, when Ibn Battuta, along with 15 ambassadors representing Ukhaantu Khan, emperor of the Mongol Chinese Yuan dynasty, travelled to Kol city en route to the coast at Cambay (in Gujarat) in 1341. According to Battuta, it would appear that the district was then in a very disturbed state since the escort of the Emperor's embassy had to assist in relieving Jalali from an attacking body of Hindus and lost an officer in the fight. Ibn Batuta calls Kol "a fine town surrounded by mango groves". From these same groves the environs of Kol would appear to have acquired the name Sabzabad or "the green country".

In the reign of Akbar, Kol was made a Sirkar and included the dasturs of Marahra, Kol ba Haveli, Thana Farida and Akbarabad. Akbar and Jahangir visited Kol on hunting expeditions. Jahangir clearly mentions the forest of Kol, where he killed wolves.

During the time of Ibrahim Lodhi, Muhammad, son of Umar, was the governor of Kol. He built a fort at Kol and named the city Muhammadgarh, after himself, in 1524–25. Sabit Khan, who was then the governor of this region, rebuilt the old Lodhi fort and named the town Sabitgarh, after himself.

The ruler of Koil was Bargujar King Bahadur Singh who, in 1753, rose against the destruction of Hindu temples. The Jat ruler, Surajmal, with consent of Safdar Jang, occupied the fort of Koil. Bahadur Singh continued the battle from another fort and died fighting in what is known as the "Battle of Ghasera". It was renamed Ramgarh and Rao Durjan Singh Poonia of Bijauli was made the kiledar of the fort. When a Persian Mughal Shia commander, Najaf Khan, captured Ramgarh, he renamed it and gave it its present name of Aligarh. Aligarh Fort (also called Aligarh Qila), as it stands today, was built by French engineers under the control of French officers Benoît de Boigne and Perron.

The Battle of Aligarh was fought on 1 September 1803 during the Second Anglo-Maratha War (1803–1805) at Aligarh Fort. The British 76th Regiment, now known as the Duke of Wellington's Regiment besieged the fort, which was under the control of the French officer Perron, and established British rule. In 1804, the Aligarh district was formed by the union of the second, third and fourth British divisions with the addition of Anupshahr from Muradabad and Sikandra Rao from Etawa. On 1 August 1804, Claude Russell was appointed the first Collector of the new district.

Aligarh district is divided into five tehsils, namely Kol Tehsil, Khair Tehsil, Atrauli, Gabhana and Iglas. These tehsils are further divided into 12 blocks.

The city is administered by Nagar Nigam Aligarh (Municipal Corporation), which is responsible for performing civic administrative functions administered by Mayor and Municipal Commissioner (PCS Officer). Infrastructure development of the city is looked after by the Aligarh Development Authority (ADA) administered by Divisional Commissioner (chairman) and vice-chairman (PCS Officer).

Aligarh is the headquarters of Aligarh Police Range and Aligarh Division. A DIG looks after Aligarh for legal condition and law; a Commissioner looks for four districts of Aligarh Division (Aligarh, Etah, Hathras, Kasganj).

According to the 2011 Census, Aligarh has a total population of 874,408, of which 461,772 are males and 412,636 are females. Population in the age range 0–6 years is 119,543. The literacy rate is 59.15%, of which the male literacy rate is 63.42% and female literacy rate is 54.37%. The effective literacy rate of 7+ population of Aligarh was 68.5%, of which male literacy rate was 62.9% and the female literacy rate was 70.8%. The Scheduled Castes and Scheduled Tribes have a population of 138,184 and 332 respectively. There were 147,363 households in Aligarh as of 2011. The city lies in the cultural region of Braj.

• 
  Sunni Muslim, Aligarh
• 
  Shia Muslim, Aligarh

Hindi is the most spoken language. Urdu is the second-largest language.

Aligarh is located at the coordinates 27°53′N 78°05′E / 27.88°N 78.08°E / 27.88; 78.08. It has an elevation of approximately 178 metres (587 feet). The city is in the middle portion of the doab, the land between the Ganges and the Yamuna rivers. The Grand Trunk Road passes through it via NH-91 is 134 km from capital of India.

Aligarh has a hot semi-arid climate (Köppen BSh) a little too dry to be a monsoon-influenced humid subtropical climate (Cwa). Summers start in April and are hot with temperatures peaking in May. The average temperature range is 28–38 °C (82–100 °F). The monsoon season starts in late June, continuing until early October, bringing high humidity. Aligarh gets most of its annual rainfall of 800 millimetres (31 in) during these months. Temperatures then decrease, and winter sets in December, and continues until February. Temperatures range between 2–11 °C (36–52 °F). Winters in Aligarh are generally mild, but 2011–12 experienced the lowest temperature of 1 °C. The fog and cold snaps are extreme.

The city is an agricultural trade centre. Agricultural product processing and manufacturing are important.

Aligarh is an important business center of Uttar Pradesh and is most famous for its lock industry. Aligarh locks are exported across the world. In 1870, Johnson & Co. was the first English lock firm in Aligarh. In 1890, the company initiated production of locks on a small scale here.

Aligarh is famous for its brass hardware and sculptures. The city has many manufacturers, exporters, and suppliers involved in the brass, bronze, iron and aluminium industries.

Indian Diecasting Industries which manufactures aluminium and zinc die-casting parts is located at Sasni Gate in Aligarh.

Harduaganj Thermal Power Station (also referred as Kasimpur Power House) is 15 km from the city. Narora Atomic Power Station is located 50 km from Aligarh.

• Aligarh Muslim University campus is spread over 467.6 hectares in the city.
• Ibn Sina Academy of Medieval Medicine and Sciences
• Jamia Al-Barkaat
• Mangalayatan University

• Our Lady of Fatima Senior Secondary School, Aligarh
• STS School

Aligarh is associated with an applique and embroidery art known as phool patti ka kaam.

Aligarh has several popular landmarks. Most notable few of them are Aligarh Fort, Jama Masjid, Khereshwar Temple which is the birthplace of Swami Shri Haridas Ji, Dor fortress (1524), which is now in ruins, lies at the city's centre, its site is in the area now called Upper Fort (Balai Qila) and is occupied by an 18th-century mosque. The area Shah Jamal is very famous for a Sufi saint Syed Shah Jamal is also known as Shamsul Arifeen, of whom the tomb is located at Shahjamal area and surrounded by a graveyard. The Sufi Saint is mentioned by Ibn Battuta in his book The Travels of Ibn Battuta. The saint is said to be of Sufi Chishtiya order.

The Annual Cultural Exhibition, popularly known as Numaish, is held at the exhibition ground in January and February. The land Numaish Ground was donated by Nawab Rehmat Ullah Khan Sherwani. The cultural shows take place at three grand stages (Kohinoor, Krishnanjali and Muktakash). In all, more than 150 stage events featuring artists from across India take place during a period of 28–30 days.

• Shekha Jheel, Bird Sanctuary
• Maulana Azad Library, AMU (Estd 1875)
• Naqvi Park.
• Sir Syed Masjid in Aligarh Muslim University's campus.

Aligarh Muslim University (AMU) is one of the oldest central universities. It was established by Sir Syed Ahmed Khan as Madrasatul Uloom Musalmanan-e-Hind in 1875–78 which later became Mohammedan Anglo-Oriental College (MAO College). It was designed to train Muslims for government services in India and prepare them for advanced training in British universities. The Mohammedan Anglo-Oriental College became Aligarh Muslim University in 1920. It is famous for its Law, Medical, and Engineering courses.

Ibn Sina Academy of Medieval Medicine and Sciences maintains 'Museum on History of Medicine and Sciences' and 'Museum on Arts, Culture and Orientalism'. It was established by a family Hakim Syed Zillur Rahman and Syed Ziaur Rahman at the heart of the city and near a busy market of Dodhpur.

Aligarh Junction railway station is the primary station for Aligarh city and is a major stop on the Delhi-Kolkata route. It is an A-Class railway station. It is one of the oldest railway station of this route. It connects Aligarh to the states of West Bengal, Odisha, Bihar, Jharkhand, north-east and most of Uttar Pradesh, and important stations of cities such as New Delhi railway station, Mumbai Central, Kolkata, Bhopal Junction railway station, Indore, Jammu, Gwalior, Lucknow, Jhansi, Puri, Kanpur Central railway station, Etawah Junction railway station, Tundla Junction railway station, Agra Cantonment railway station and Varanasi. Aligarh railway station handles over 136 trains daily (in both directions) and serves around 204,000 passengers every day. Aligarh has one Branch Railway Line to Bareily.

Aligarh City has following railway stations:

• Aligarh Junction: an A-Class Railway Station
• Somna (Gabhana) railway station
• Mahrawal railway station
• Kalua railway station
• Daudkhan railway station
• Mandrak railway station
• Harduaganj railway station (Satha, near Kasimpur Power House)
• Manjoorgarhi railway station (Chherat)

Aligarh is 140 km from New Delhi. It is one of the Division of UPSRTC. Uttar Pradesh State Road Transport Corporation (UPSRTC) buses serve cities all over the state and cities in Uttarakhand, Rajasthan, Madhya Pradesh and Haryana.

Aligarh City has three UPSRTC bus stations:

• Aligarh Depot(Old Bus Station/Gandhi Park Bus Station) bus station
• Masoodabad(esta. 2000) (Budh Vihar Bus Station/New Bus Station/Workshop Bus Station/Raghuveerpuri Bus Station/Mathura Bus Station) Depot bus station(non-functional from 2018 to 2021)(now functioning since 2021 post renovation into a well facilitated Bus Station)
• Aligarh Satellite Bus Stand(New Bus Station/Sootmill Bus Station/Sarsaul Bus Station)(functioning since 2018 due to sudden non-functioning of Masoodabaad Bus Station during 2018-2021 period)

There are buses plying from Aligarh to Delhi at frequent intervals via

1) Khair, Tappal, Palval, Faridabad, Delhi - The route is under construction between Khair and Palval and should be strictly avoided by cars. No toll charges.

2) Khair, Tappal, Yamuna expressway, Noida, Greater Noida, Delhi, Gurgaon - Best and recommended route for Delhi, Noida, Gurgaon. Toll Charges are ₹120 between Aligarh and Delhi.

3) Old GT Road, Bulandshahr, Ghaziabad, Delhi - NH 91 - It is a 6-lane highway. Toll charges are ₹285.

Following Highways are connected to Aligarh:

• National Highway 91 - It connects Kolkata to national capital New Delhi. Ghaziabad-Bulandshahr-Aligarh section is a 6-Lane Highway.
• National Highway 93 - It connects Moradabad to Taj Nagri Agra via Aligarh. Aligarh-Agra section is constructed as Brijbhoomi Expressway.
• Yamuna Expressway - It is a 6-Lane Expressway connecting Greater Noida with Agra.

Aligarh City has Mahanagar Bus Service (City Bus Service) which provides local transport to Aligarh.

• Route-1 J N Medical College-Uperkot
• Route-2 Gandhi Park-Sarsaul/Sootmill
• Route-3 Ghantabagh-Quarsi
• Route-4 Gandhi Park-Boner
• Route-5 Etah Chungi-Collectrate

Apart from this an Air-conditioned Electronic Bus Service has been running within the city since January 2022.

Aligarh Airport, Situated on NH 91, Dhanipur, Aligarh, Uttar Pradesh. It is Also known as Dhanipur Air Strip/Dhanipur Hawai Patti. This airport is also used as flying Club. The Government of Uttar Pradesh signed a memorandum of understanding with the Airports Authority of India in February 2014 for the development of the airport.

At this time direct flight started by the regional airline Flybig from Lucknow to Aligarh and vice versa under the RCS-UDAN scheme.

The nearest international airport from Aligarh is Indira Gandhi International Airport, New Delhi. It is 140 km from Aligarh.

Another nearest airport from Aligarh is Agra Airport, Agra. It is about 98 Km from Aligarh

• Sheela Gautam, founder of Sheela Foam Limited-Sleepwell
• Vijay Shekhar Sharma, founder of Paytm
• Khwaja Abdul Hamied, Pharmacist, founder of Cipla

• Ziauddin Ahmad, mathematician, M.L.A. (Central), Vice-Chancellor of Aligarh Muslim University Movement. He established several institution including J.N. Medical College
• Roshan Ara Bokhari, dancer, choreographer and dance teacher
• Masud Husain Khan, linguist, the fifth Vice-Chancellor of Jamia Millia Islamia and the first Professor Emeritus in Social Sciences at Aligarh Muslim University
• Syed Ahmad Khan, founder of Aligarh Muslim University
• Shafey Kidwai, academic, bilingual critic, translator, columnist, author, professor in the Department of Mass Communications at Aligarh Muslim University

• A.R. Akela, Dalit author and publisher, owner of "Anand Sahitya Sadan
• Syed Amin Ashraf, Urdu poet and professor of English at AMU
• Qurratulain Hyder, Padma Bhushan, Urdu novelist, writer, and journalist
• Akhlaq Mohammed Khan, pen name Shaharyar, Urdu poet, Bollywood lyricist and served as Professor at Aligarh Muslim University
• Munshi Nawal Kishore, book publisher
• Jainendra Kumar, Hindi writer
• Gopaldas Neeraj, poet, recipient of Padma Bhushan
• Saghar Nizami, Urdu Poet
• Prem Kishore Patakha, Hindi Humorous Poet
• Maitreyi Pushpa, Hindi fiction writer
• Gafil Swami (born 1953), Hindi poet
• Rameshraj Tewarikar, Hindi Tewari poet, Editor:′ Tewari-Paksha (tri-monthly)

• Irfan Habib, eminent Indian historian and Professor Emeritus at Aligarh Muslim University
• Mohammad Habib (1895–1971), noted Indian historian and served as Professor Emeritus at Aligarh Muslim University

• Shamim Ara, Pakistani film actress
• Bharat Bhushan, Bollywood actor
• Aadesh Chaudhary, Indian television actor
• Nitin Chauhaan, Indian television actor
• Ravindra Jain, Bollywood music director
• Kanika Maheshwari, Indian television actress
• Alka Nupur, former actress, kathak dancer
• Mohd Sharia, Bollywood actor
• Chandrachur Singh, Bollywood actor
• Hasan Zaidi, Indian television actor
• Zarina, Indian artist

• Piyush Chawla, Indian cricketer
• Zafar Iqbal, Former hockey captain of India
• Annu Raj Singh, international shooter
• Rinku Singh, Indian Cricketer

• Mukta Raja, MLA of Aligarh
• Zafar Alam ex-MLA from Aligarh (Assembly constituency)
• Dalbir Singh Chaudhary, MLA from Baruli vidhansabha constituency
• Mohammad Furqan, Former mayor of Aligarh
• Satish Kumar Gautam, MP from Aligarh (Lok Sabha constituency)
• Sheela Gautam, ex MP and ex chairperson of Sleepwell
• Zameer Ullah Khan ex MLA from Koil (Assembly constituency) and Aligarh (Assembly constituency)
• Jamal Khwaja, ex MP
• Sanjeev Raja, ex MLA
• Bijendra Singh, ex MP
• Chaudhary Sunil Singh, ex MLC
• Kalyan Singh, ex governor and ex Chief Minister of Uttar Pradesh
• Rajendra Singh, ex Agriculture and Irrigation Minister, Govt of Uttar Pradesh
• Sandeep Singh, MLA Atrauli, grandson of Kalyan Singh former Chief Minister of Uttar Pradesh
• Thakur Jaivir Singh, ex MLA (Now MLC)
• Roohi Zuberi, advocate

• Khwaja Abdul Hamied, pharmacist, founder of Cipla (pharmaceutical company)
• Prerna Kohli, clinical psychologist, social worker and author
• Hakim Syed Zillur Rahman, Unani physician and author
• Syed Ziaur Rahman, pharmacologist, researcher and author
• Ashok Seth, an Indian interventional cardiologist

• Javed Abidi, born with spina bifida, he was an activist working for the disabled community and served as the first director of the National Centre for Promotion of Employment for Disabled People (NCPEDP) and founded Disability Rights in India
• Jai Kishan Das, a close associate of Sir Syed Ahmad Khan

• Jamia Millia Islamia

• Aligarh in My Days (Interviews of former Vice-Chancellors of Aligarh Muslim University), Ed. Syed Ziaur Rahman, Non-Resident Students' Centre, Aligarh Muslim University, Aligarh, 1997.
• Atkinson, Edward (2010) [1875]. Descriptive And Historical Account of the Aligarh District. Nabu Press. ISBN 978-1-147-42719-6.