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

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Latest News

what's happening at Chesham Grammar

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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Posted Oct 6 - 2025

CGS wins Bronze in 'Chesham in Bloom'

After entering the 'Chesham in Bloom' schools’ competition for the first time this summer, CGS was delighted to receive the Bronze Award...

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Posted Sep 25 - 2025

Darwin House gives to One Can Trust

Darwin House Captains, Oliver and Francesca, and House Leader Miss Day-Haynes took all the food donations collected for One Can Trust on CGS’s f...

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Posted Aug 21 - 2025

GCSE Results 2025

Congratulations to Year 11 students at Chesham Grammar School! They have achieved impressive GCSE results this morning, with 23% of results awarded ...

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Posted Aug 20 - 2025

A-Level Results 2025

Year 13 students at Chesham Grammar School are celebrating, having achieved excellent A-Level results. Almost 60% of entries were graded A*/A ...

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Latest Events

what's coming up at a glance

12thDecember

Shakespeare Charity Day - Save the Children

15thDecember

Christmas Words & Music

18thDecember

End of Autumn Term - School closes @ 1:15pm

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Latest Tweets

Fantastic evening at Wembley watching the England Lionesses vs China. pic.twitter.com/SlsxgHR8yO
Chesham Grammar School @CGSBucks
A big thank you to Arran (Class of 2021), Kate (Class of 2016) & Tom (Class of 2018) for coming back to @CGSBucks this week to talk to students about their careers in the creative industry #cgsalumni #careersincreativeindustry pic.twitter.com/Wf7MX3tvrM
Chesham Grammar School @CGSBucks
Huge thank you to our amazing sport leaders that helped organise and officiate all of the winter house sport events this week. pic.twitter.com/q69GVar4Ox
Chesham Grammar School @CGSBucks
WINTER HOUSE SPORT - RESULTS 🚨 Well done to all 1300 students in Year 7-13 for taking part in the annual winter house sport event this week. There were competitions in ⚽️, 🏐, 🏸 and 🏓 The results… 1st - Shakespeare 2nd - Franklin 3rd - Darwin 4th - Austen
Chesham Grammar School @CGSBucks
Our winning students from the National Careers Challenge were invited to attend a reception at the House of Lords today. Top industry professionals and entrepreneurs shared their insights on the importance of learning valuable workplace skills @CGSBucks #Befutureready pic.twitter.com/KTsLK1x8vH
Chesham Grammar School @CGSBucks
Well done to the Yr 10 FB team, who overcame a 1-3 2nd half deficit, to eventually win 6-3 away at Misbourne. A succession of CGS chances were missed, until 5 goals in the last 20 mins from Joe F (hat-trick), a brace from Josh S and a cross/shot from Max M-W secured the win
Chesham Grammar School @CGSBucks
Well done to the Junior, Inter and Senior swim teams who took part in the Herts swim league this evening hosted at Haberdashers’ Aske school. 🏊‍♀️ The Senior Boys won all of their races, as did Geriant J for the Inter Boys. Full results to follow. pic.twitter.com/ytLwPysAFM
Chesham Grammar School @CGSBucks
Defeat on the road in the county cup for the 1st XI girls Football team. 2-0 down, then 3-2 up but two late goals from @shfgs_sport gave them the 4-3 win. Lots of positives to take into our final group game. Lucy B ⚽️⚽️ Evie K ⚽️ PoM: Lucy B pic.twitter.com/Y4apLNbCmT
Chesham Grammar School @CGSBucks
U13 Boys had their first hockey fixture this evening. Some fantastic play from all boys. With a 0-0 draw against SWBGS, the boys are undefeated 🎉 POM: Quin, special mention to Atiksh for going in goal pic.twitter.com/Wawp6glWtH
Chesham Grammar School @CGSBucks
U15 Girls football team had a thriller of a game vs CCC. Great win, goals from Lucy ⚽️⚽️⚽️, Poppy ⚽️⚽️, Liv, India and Jessie. Well played girls POM: Lucy pic.twitter.com/lUQAgg8Zsu
Chesham Grammar School @CGSBucks
A reminder that we have our Christmas Fair this evening from 6pm to 9pm. Huge thanks to the Friends of CGS @CGS_PTA for organising what is always a magical evening!
Chesham Grammar School @CGSBucks
A great team performance from the U13 Girls Football team saw them record a good win against Chiltern Hills Academy in the Chesham Derby in the County Cup today. Goals were scored by Lucy B ⚽️⚽️⚽️ Alice M ⚽️⚽️ Abi N ⚽️ Charlotte G ⚽️ Own Goal ⚽️ POTM: Charlotte G pic.twitter.com/mV1gTquAfn
Chesham Grammar School @CGSBucks