Announcement /

Open Evening - Thursday 2nd July 2026Read More

A message from the Headteacher

Welcome to Chesham Grammar School, an outstanding, co-educational school of over 1300 students. CGS has a reputation for excellence. We have high academic standards and superb examination results.

Almost all of our students progress to their first choice university including Oxford and Cambridge. Our students will be the leaders of tomorrow and our aim is to ensure that they are well equipped for 21st century life. We want them to be confident, articulate and optimistic as well as respectful, tolerant and compassionate. Above all, we want them to be happy.

With best wishes,

Annmarie McNaney

Headteacher

Read more from the Headteacher

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Latest News

what's happening at Chesham Grammar

Posted Dec 17 - 2025

On The Hill

We are pleased to share the latest edition of our school magazine: On The Hill.

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Posted Dec 16 - 2025

Anthony Nolan makes lifesaving connection with CGS students

We were delighted to welcome representatives from Anthony Nolan to CGS to speak with our Year 13 students. The session provided an informative an...

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Posted Dec 12 - 2025

Serious Fun from Shakespeare!

Shakespeare House hosted a seriously fun and festive charity day to raise money for Save the Children. Students were invited to wear Christmas jumpers...

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Posted Dec 4 - 2025

Nathan Law inspires our Sixth Formers

We were very honoured to welcome Nathan Law, founder of Civic Square, a charitable initiative dedicated to democracy education, to CGS to speak t...

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Posted Nov 27 - 2025

Discover! Creative Careers Month

It's 'Discover Creative Careers Month' and we are delighted to be hosting a series of talks from creative alumni and industry professional...

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Posted Nov 18 - 2025

Austen House visits Tiggywinkles

Austen House Captains Lotta and Iona, House Leader Ms Maishman, and a handful of students visited Tiggywinkles Wildlife Hospital to deliver all the ge...

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Latest Events

what's coming up at a glance

5thJanuary

Start of Spring Term for Whole School

30thJanuary

FoCGS Comedy Night

30thJanuary

Franklin House Charity Day

10thMarch

11thMarch

12thMarch

13thMarch

20thMarch

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Latest Tweets

The school is now closed for Christmas until Friday January 2nd 2026. Wishing everyone a wonderful festive season.
Chesham Grammar School @CGSBucks
Well done to all those involved in our application to work with Baroness Sheehan, chair of the House of Lords Environment and Climate Change Committee who said ‘I was very impressed with the high standard of application I received from Chesham Grammar School’. Very proud!
Chesham Grammar School @CGSBucks
Local school selected to take part in national scheme with House of Lords https://t.co/ALeGjTivVQ
Chesham Grammar School @CGSBucks
Wishing the whole CGS community a peaceful and relaxing Christmas break. I look forward to welcoming everyone back on January 5th. 🎄🎄🎄
Chesham Grammar School @CGSBucks
Members of our Student Senior Leadership Team have been out and about in Chesham today, delivering Christmas hampers to local care homes for the elderly. Many thanks to our parents for their very generous donations. pic.twitter.com/i7cQcqfvjO
Chesham Grammar School @CGSBucks
Many thanks to all the alumni who have returned for Year 10 Aspiration Day, inspiring the next CGS generation. Many thanks to Mrs Lovelace and Mrs Ware for organising. pic.twitter.com/ZvelKh0e8d
Chesham Grammar School @CGSBucks
Many thanks to students and staff involved in Christmas in Words and Music last night. In the beautiful setting of Broadway Baptist Church, we were treated to a wonderful range of music and readings from students across the school. pic.twitter.com/3lvGOFor2z
Chesham Grammar School @CGSBucks
Year 7&8 Girls played a friendly football tournament against Holmer Green School. Some wins, draws and loses, and some great play from all students pic.twitter.com/phJp0PoWwv
Chesham Grammar School @CGSBucks
Well done to the Yr 11 Football team who won their District cup semi-final vs Amersham school. The whole squad put in a fantastic performance to win 5-1 on the day. John B ⚽️ Naitik ⚽️ Henry U ⚽️ Felix C-N ⚽️ OG ⚽️ MoM - Henry R
Chesham Grammar School @CGSBucks
Well done to the Yr 9 Rugby squad, who were exceptional in a narrow 14-19 defeat to DCGS. Some top performances were rewarded with tries for Oscar & Lennon, both converted by Billy. In their first ever game, Jack E & Bobbie H were fantastic, as were Freddie, Toby, Ethan & Jac pic.twitter.com/HBJuNASTa6
Chesham Grammar School @CGSBucks
What a great charity day today, raising money for Save The Children. An amazing range of Christmas jumpers on show and a very competitive football match at lunchtime involving staff and Sixth Formers. Well done all and thank you Olivia and Alice, Shakespeare House Captains. pic.twitter.com/5mYk14RQJI
Chesham Grammar School @CGSBucks
As part of our Christmas Jumper Day, Year 7s took part in a Santa Dash at breaktime. pic.twitter.com/tV2b6G3O0p
Chesham Grammar School @CGSBucks