Karachi Grammar School (Urdu: کراچی گرامر اسکول) is an independent, English-medium school located in 3 different campuses across Karachi. The main and oldest campus is located in Saddar, Karachi, Sindh, Pakistan. It is a highly selective, coeducational day school (formerly a day/boarding school) serving approximately 2,400 students aged between three and nineteen years.

Established in 1847 by the Reverend Henry Brereton, the first chaplain of Karachi, as a school for "English and Anglo-Indo children", it is the oldest private school in Pakistan and the second oldest in South Asia, a member of the Winchester International Symposium and a former member of the Headmaster's Conference.

Since the 1980s, Karachi Grammar School has expanded from a school with a population of a few hundred students to a large institution that now occupies three sites and teaches more than two thousand students.

Karachi Grammar School was founded as the Anglo-Indian School in 1847. It remained the only non-native school in the town until St. Patrick's High School, Karachi, was founded in 1861, followed by St. Joseph's Convent School, Karachi, in 1862, and Manora School in 1866. Reverend Henry Brereton, the First Chaplain of Karachi, established the school and provided the early accommodation for the school at his private residence, with the first classes taking place in his kitchen. The class formed by the chaplain was at first small enough to be accommodated in these modest premises; however, the smooth running of this school over the next seven years was disturbed by rumours of Brereton not being a "good master" and his performance as a manager being unsatisfactory.

Looking into this matter, on 27 July 1854, the Commissioner of Sindh, Sir Bartle Frere, summoned a public meeting with a view to establishing an institution that provided 'good secular instruction to children of all sects'. In this meeting, funds were collected through subscriptions to establish a school, a managing committee was appointed and rules were framed that later became the basis for the present Constitution of KGS. It was the newly appointed, managing committee that decided to purchase the Mess House of Her Majesty's 64th Regiment at No. 24 Depot Lines, which is at the site of the present day Middle School. The reorganized school was formally opened on 1 November 1854 as "The Kurrachee European and Indo-European School".

The school continued on its regular course with a small student body of around 40 children. In 1874, Reverend G. B. Streeton, then Chaplain of Karachi and Honorary Secretary of the school, suggested a plan that included expanding the school premises and securing a title deed for the land the school was to occupy, which could only be completed by August 1890 due to complications regarding the government's rights to the resumption of cantonment land.

Streeton raised ₨ 4,918, which enabled his plan to go ahead. Captain Thomas F. Dowden of the Royal Bombay Engineers was commissioned to make the architectural drawings for the new building. The new school building was opened for boarders on 27 February 1875 by Sir William Merewether, Commissioner-in-Sind at that time. The role of children was 75 in 1875 and 90 children in 1876 with six teachers, implying a pupil-teacher ratio of 15:1.

During the following years, the school flourished. It was endowed with a library in memory of a local doctor. In 1879, the school was renamed from "The Kurrachee European and Indo-European School" to "Karachi Grammar School".

In 1901, the school went through a difficult time after the headmaster, Mr. Taylor, was forced into resignation by the school's managing committee; the number of students decreased considerably over the course of the following year. Taylor opened his own school named "Taylor High School". In 1902, Taylor returned along with the pupils from his private school. During the next three years, the school improved academically; however, it struggled financially, barely affording the employees. In 1910 the school received a grant of Rs. 2000, which continued over the next thirty years and rescued it from financial crisis.

In 1912, Bernard Tobin was the first pupil to take and pass the Cambridge School Certificate Examination. Additionally, this year marked the first scouts enrolled in the school. Towards the end of 1914, construction began on the third story of the school, and students were temporarily taught in a building on Merewether Road, which was given free of charge. The total count of students had reached 151.

Karachi Grammar School gives its students 15 years of education on three different sites. The Kindergarten and Junior sections are accommodated in one site in Clifton, with students spending Nursery, Prep, Grades 1 and 2 in the Kindergarten Section, and Grades 3–6 in its Junior Section. Children spend three years in Grades 7–9 in the middle school located on the Saddar site. On the senior level, the college section, also located in Clifton, is geared towards preparing students for the GCE ordinary Level, advanced subsidiary level, and advanced Level examinations.

Subjects taught at KGS include physics, chemistry, mathematics, biology, computer studies, computing, Pakistan studies, Urdu, Islamiyat, English Literature, English Language, economics, accounting, business studies, world history, art, world geography, psychology, sociology, and media studies.

• 
  College Section, Clifton
• 
  Middle Section, Saddar
• 
  Kindergarten and Junior Section, Clifton

In the Junior Section, extracurricular activities available include sports, music, swimming, a school choir, scouts and girl guides, community service, etc. In the Middle Section, activities and events are organized through clubs and societies, such as the Biology and Philosophy clubs and the Helper's Society. At the College Section, there are several societies and clubs, such as those focused on humanities and arts, like the Eastern Music Society, Urdu Society and the Dramatica Club, as well as those focused on STEM, notably the Einstein Society and Mathematics Society, among others. Karachi Grammar School also hosts many national and inter-school competitions and events, such as Karachi Grammar Science Olympiad, Karachi Grammar Mathematics Olympiad, KGX, Karachi Grammar Entrepreneurship Summit, Grammart, and Grammun.

The school has won national and international debate competitions. It maintains a Parliamentary Debate Team, several of whom have represented Pakistan in the World Schools Debating Championships.

Karachi Grammar School is also known for its Model United Nations team. It has entered competitions including LUMUN (Pakistan's largest international Model United Nations conference, hosting over 1200 delegates), where the school team won in 2008, 2009, 2012, 2015, 2019, 2020 and most recently, in 2021. Karachi Grammar School also took part in Harvard Model United Nations 2012 in Beijing, China, winning the 'Best Large Delegation' award. In August of the same year, Karachi Grammar School sent a 12-member delegation to Hyderabad, India, to attend the 2nd session of the Harvard Model United Nations India. Once more, the delegation received the overall Best Large Delegation Award out of over 100 delegations and 800 delegates. This made the school the winner at both of Harvard's international high school MUN conferences (China and India). In the following years, KGS was once again declared the Best Large Delegation at Harvard MUN India 2013 and Harvard MUN China 2014, 2015. They won Best International Delegation at HMUN Boston 2016 as well as HMUN China 2017, sustaining an undefeated streak at international MUN conferences. In 2022 the KGS Model United Nations Team founded KGSMUN their flagship MUN Conference.

In 2018, the school's parliamentary debating team went to Turkey for the annual EurAsian Schools Debating Championship and secured first place, defeating the Greece national team in the finals. This was the first Pakistani team to ever win an international parliamentary debating championship.

The four school houses are:

•   Frere (for Sir Henry Bartle Frere, Bt., G.C.B.)
  Established: 1930
  Motto: Fortiter, Fideliter, Feliciter (Latin)
  Motto in English: Bravely, Faithfully, Happily
  Mascot: Phoenix (formerly Native American)
•   Napier (for Gen. Sir Charles James Napier, G.C.B.)
  Established: 1930
  Motto: Universi Stamus (Latin)
  Motto in English: In Unity Lies Strength
  Mascot: Panther
•   Papworth (for a former principal, Papworth, M.B.E.)
  Established: 1999
  Motto: Virtus Vincit Omnia (Latin)
  Motto in English: Virtue Conquers All
  Mascot: Shark
•   Streeton (for the Rev. G. B. Streeton, M.A.)
  Established: 1930
  Motto: Excelsior (Latin)
  Motto in English: Ever Upwards
  Mascot: Dragon

The house system was introduced in 1929, and the houses were originally known as A, B, and C; the following year the house names were changed to Napier, Frere, and Streeton, respectively.

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Name	Class year	Notability	Reference(s)
Arif Alvi		Current President of Pakistan
Aliza Ayaz	2017	United Nations youth ambassador, climate activist, Cannes Film Festival sustainability director
Qazi Faez Isa		Supreme Court judge
Hammad Nassar		Art curator, gallerist, author
Sadeq Sayeed		Hedge fund manager, known for his role behind Nomura's acquisition of the European, Middle Eastern and African businesses of Lehman Brothers
Arif Naqvi		Founder of The Abraaj Group, philanthropist
Rayid Ghani		Academic, Director of the Center for Data Science and Public Policy at the University of Chicago
Hareem Farooq		Actress
Asif Ali Zardari		Co-Chairman of the Pakistan People's Party Former President of Pakistan, and husband of former Prime Minister of Pakistan, Benazir Bhutto
Sabeen Mahmud		Humanitarian and social worker
Nadeem F. Paracha	1983	Journalist, cultural critic, satirist, historian, author
Reza Ali Mirza		Tennis player, first Pakistani to win a round at Wimbledon
Nadia Zaffar		Dawn News anchor, producer
Dr. Asim Hussain H.I.		Founder of Ziauddin University
Faizan S. Syed		Businessman, CEO of HTV
Haroun er Rashid FRGS		Geographer
Sahibzada Muhammad Usman Khan Abbasi		Member of the Provincial Assembly for Bahawalpur in the Punjab Provincial Assembly 1987-2002, Deputy Speaker 1993-1997
Nawabzada Muhammad Aslam Khanji Moin ud-din Khanji Babi		Heir apparent to the kingdom of Bantva Manavadar, cricketer
Masood Ahmed		President of the Center for Global Development. Former Director of the IMF and former Vice President for World Bank.
Chishty Mujahid	1962	Cricket commentator
Rabiya Javeri Agha		Federal Secretary
Atta ur Rahman	1960	Organic chemist; Fellow Royal Society of London; Federal Minister for Science and Technology
Benazir Bhutto	1969	Former Prime Minister of Pakistan and first elected female head of state of the Muslim World.
Chaudhary Muhammad Ali		Nuclear physicist; Political-defence analyst
Dail Jones	1959	New Zealand politician; member of the New Zealand First party, was a former party president
Princess Sarvath al-Hassan		Princess, husband was once Crown Prince of Jordan
Ghulam Mustafa Jatoi		Politician; acting prime minister of Pakistan
Thomas W. Simons Jr.		Former ambassador, visiting scholar at Cornell and at Harvard's Davis Center for Russian and Eurasian Studies, escorted Duke Ellington during his tour of Pakistan
Arthur Edward Cumming		Recipient of the Victoria Cross, the UK's highest award for valour
Navin Rizwi	2003	Producer, Emmy Nominee
Hameed Haroon		CEO Dawn Media Group
Hussain Haroon		Pakistani ambassador to the United Nations
Jamil Dehlavi		Film director and producer
Kamila Shamsie		Novelist
Kumail Ali Nanjiani	1996	Comedian, actor, director in America
Maliha Lodhi		Pakistani political scientist, diplomat, columnist, and military strategist; former High Commissioner of Pakistan] to the United Kingdom; former Pakistani Ambassador to the United States; Permanent Representative of Pakistan to the United Nations, the first women to hold the position
Murtaza Bhutto	1971	Politician; senior member of Pakistan Peoples Party
Mohammad Ali Shishmahal	1972	Senior Environmentalist:Environmental & Social studies, Thar, Guddu Barrage, Jamshoro Power Project, Karachi Water & Sewerage project. Former Secretary Sindh Swimming Association
Ameena Saiyid		Publisher
Nafisa Shah	1986	Member of National Assembly, Chair of the National Commission for Human Development, General Secretary of the Women's Parliamentary Caucus
Nazia Hassan		Pop singer
Pervez Hoodbhoy		Nuclear physicist; Political-defence analyst
Tapu Javeri		Radio host, photographer, jewelry designer
Sabiha Sumar		Filmmaker
Furquan Kidwai		Entrepreneur, pioneer of the digital health industry of Pakistan. Founder of Dawaai Technologies
Sharmeen Obaid-Chinoy	1997	Documentarian, Journalist, two time Academy Award winner, five time Emmy winner
Sherry Rehman		Former Pakistani Ambassador to the United States, former Editor of Herald Magazine, senior member of Pakistan Peoples Party
Waheed Murad	1954	Actor, producer, scriptwriter
Ali Jehangir Siddiqui	1995	Ambassador of Pakistan to the United States (2018), Diplomat, Businessman, Special Assistant to the Prime Minister of Pakistan (2017-2018), Pakistan's Ambassador at Large for Foreign Investment (2019-2022).

• Aitchison College
• La Martiniere Lucknow
• Winchester College
• The Lyceum School

• Karachi Grammar School website