|Type|| • Comprehensive|
• Previously a Foundation school. Since 2011 Academy
|Motto||Tenax propositi ulteriora peto (1927–present) Learn, Achieve, Enjoy, Succeed|
|Established||The school year starting in September 1927|
|Department for Education URN||136534 Tables|
|Chair & Vice Chair of Governors||Elizabeth Pepper & Alex Skinner|
|Headteacher||Mr M Duffield|
|Gender||Boys (girls admitted for sixth form)|
|Age||11 to 18|
|Houses|| • Abbey|
• St. Benett
The school was rated as an "outstanding" school in January 2009 and at the next, and most recent inspection in May 2012 by Ofsted, the non-ministerial government department of Her Majesty's Chief Inspector of Schools In England. Former pupils include Jack Cork, who is an English football player who currently plays for the team Swansea City.
The school was originally called Epsom County Grammar School for Boys, which then was changed to Glyn County Grammar School for Boys (informally “Glyn Grammar”) at the instigation of the new headteacher Norman Dawson circa 1953. After its transformation into a comprehensive school it was named Glyn ADT and then Glyn Technology School. Latterly, from 1 April 2011, after its conversion to academy status, the school has been known as Glyn School.
As of September 1993, the sixth form began accepting applications from female students, generally from neighbouring girls' school, Rosebery. This experiment was abandoned and started again in 2005. Since then, the female population at the school has grown from a handful to represent around 25% of the sixth-form body. In 2010, the role of Head Girl was established to represent them alongside the male majority of the school.
The school's GCSE results reached successive record heights in each of the 7 years to 2013, the school's A level results of 2012 passing the previous best of 2009. The GCSE results in 2012 saw 93% gaining at least 5 GCSEs between A* to C and 86% gaining five or more including English and mathematics. 93% and 87% for 2013, ranking number 2 for two years running in Surrey for state secondary schools. The 2013 results for Glyn boys compared to boys in all Surrey state schools ranks Glyn at number 1.
In January 2010, Glyn became a National Support School and between October 2010 and January 2014, Jon Chaloner (the previous head) was executive headteacher of both Glyn and Danetree Junior School. In September 2012 GLF Schools (www.glfschools.org) was created as a multi-academy trust comprising Glyn and Danetree.
- Mr Frank Clark (1927–52)
- Mr Norman Dawson (1952–68)
- Dr Charles Bingham (1968–77)
- Mr Bryan Collins (1977–86)
- Mr Stuart Turner (1986–2006)
- Mr Jon Chaloner (2006–15)
- Mr Phillip Wheatley (2015–2017)
- Mr Matthew Duffield (2017–)
During the 2006/2007 football season, the under-thirteen team made the final of the English Schools' Football Association Boys' Cup, self-described as "'the largest 11-a-side schools' football tournament in Europe". Prior to reaching the final, the team was crowned South-East champions, which led to a semi-final played against the South-West champions at Reading F.C's Madjeski Stadium.
Students are allocated equally into eight houses upon entry. Coloured school ties represents students' houses, these include: Abbey, Bourne, Carew, Derby, Merton, Oaks, St. Benet and Tudor.
House competitions include sports and academic subjects. The house which accumulates the most merits on these combined factors at the end of every academic year is awarded with the Victor Ludorum trophy.
The prefect system
Each house appoints its own Senior Prefect, a student in the upper sixth. His or her role is to bridge the link between the school's staff and the students within the house. He or she is often responsible for organising and co-ordinating inner-house activities and inter-house competitions. Each Senior Prefect has a small group of prefects who assist. In 2009–10, the school acknowledged the growing female presence in the upper school by conferring the title of Head Girl upon a member of the upper-sixth, alongside the Head Boy and his deputies. In 2011–12, the post of Deputy Head Girl was created.
The school was judged Outstanding in 2012, under a reformed and more critical Ofsted inspection regime, the highest category as at the previous inspection. At this time, in each of the four grouped criteria assessed the school was outstanding.
In each of the main three subjects analysed, results in 2012 were grouped in the top quintile (five equal groups) nationally.
|Percentage of students achieving 5+ A*-C GCSEs (or equivalent)
including English and maths
Glyn County Grammar School for Boys
- John Austin, MP for Erith and Thamesmead (1997–2010) (Labour)
- Peter John Michael Clarke, police officer
- Douglas French, MP for Gloucester (1987–97) (Conservative)
- Dario Gradi, football manager at Crewe Alexandra F.C. Academy
- David Hemmings, operatic singer , later film actor
- Paul Stimpson, England and Great Britain Basketball
- Barry Wordsworth, musician, conductor 
- Paul Clement (football coach), Manager of Swansea City A.F.C.
- Jack Cork, England U21 footballer, currently playing at Burnley F.C.
- Paul Hodgson, a scrum-half at London Irish and England Rugby player.
- Paul Smith, ex-goalkeeper for Nottingham Forest F.C..
- "History and Timeline". GLF Schools. Retrieved 3 June 2015.
- The forename “Nathanial” previously quoted here is incorrect. In the later years of his headship the nickname “Nat” came to be used. This has led to a misunderstanding about his true name.
- ESFA. "U13 Minute Maid Boys' Cup Final Report". Retrieved 22 May 2007.
- Staff writer (30 April 2007). "Glyn Crowned South East Champions". Daily Mail. Retrieved 19 February 2011.
- Staff writer (16 May 2007). "Brister Brilliance Fires Glyn into National Final". Daily Mail. Retrieved 19 February 2011.
- Jackson, Stanley (2012). Get Me a Celebrity!: Memoirs of a Celebrity Booker. Ecademy Press. p. 73. ISBN 9781907722486.
- Notably as a boy soprano in the role of Miles in Benjamin Britten’s “The Turn of the Screw”
- Principally of the BBC Concert Orchestra