St John's College, Portsmouth
|Motto||Per Laborem Ad Honorem
(Through work to honour)
|Type||Independent day and boarding|
|Principal||Mr. Graham Best|
|Chairman of Governors||Tim Forer|
|Location||Grove Road South
|Former pupils||Old Johannians|
|Affiliation||The Society of Heads and La Sallian educational institutions|
St John's was founded in 1908 by the De La Salle Brothers as a boys' school. It moved to its current site in 1914. During the post-World War II years, under the Education Act 1944, it was one of four direct grant grammar schools in Hampshire. When the scheme was abolished during the 1970s it applied to join the state system but was refused. Instead, the school became independent and has remained so ever since. Following a trend set by many independent boys' schools, girls were admitted into the sixth form in 1971. It did not became fully coeducational until 1996.
St John's is split into four sections: a Junior School (with Little St John's Nursery) for children aged between 2 and 11; a Senior School for children 11 to 16; and a Sixth Form College for students studying for their A-Levels; and a Boarding School for children aged 9 to 18, from the UK and overseas.
St John's structures its years into a House system. For the Senior School, currently there are four houses: Leo, Edwin, Alan and Damian all named for notable Brothers who have served as Headmaster over the years. In the Junior School they have different names for the houses including: Castle, Woodleigh, St Anne's and School. The school fosters this system encouraging inter-house activities such as house 5-a-side matches and house based competitions. Points from each of these are tallied and at the end of each academic year a trophy is awarded to the house with the highest score. A similar system exists on the academic side with the Warren Trophy.
St John's ex-students formed the Old Johannian Association in 1919. Currently its members run to around 200. Subscriptions are paid at £10 per annum, which pays for the association's postage and allows for its publications. The association runs several gatherings a year, notably the AGM and Dinner Held on the first Saturday after Easter, and a Golf tournament.
Notable former pupils
- BBC newsreader George Alagiah 
- Former Black Rod, Lieutenant General Sir Michael Willcocks
- Lawrence Prittipaul, former Hampshire county cricketer and holder of the highest SJC 20-over batting total
- Alastair Appleton, TV presenter
- Tomasz Schafernaker, BBC weather presenter
- Alfie Allen, actor; brother of Lily Allen; son of Keith Allen and Alison Owen
- Alex Oxlade-Chamberlain, football player for Arsenal F.C.
- Steve Foster, football player for Portsmouth F.C. and Brighton & Hove Albion F.C.
- Anthony Minghella, film director.
- Andy Herries, Archaeologist, Palaeoanthropologist and Discipline Author notable for providing some of the first dates for our early human ancestors in South Africa.
- The Rt Hon Sir Ian Burnett (Lord Justice Burnett), was called to the Bar in 1980, was appointed to the Queen's Bench Division fo the High Court in 2008 and was promoted to the Court of Appeal in 2014.
For more information on St John's College Alumni, please see: 
- A Christian School
|chapter-url=missing title (help). Parliamentary Debates (Hansard). House of Commons. 26 January 1976.
|chapter-url=missing title (help). Parliamentary Debates (Hansard). House of Commons. 22 March 1978.
- "St John's OJA event board". Archived from the original on 2008-03-10. Retrieved 2008-04-27.
- "BBC Press Office: George Alagiah". Retrieved 28 December 2006. backup: http://www.webcitation.org/5Xw7SWb96
- "Telegraph Online: Anthony Minghella". The Daily Telegraph (London, UK). 19 March 2008. Retrieved 27 April 2008.