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

Ofsted Outstanding OP Colour HealthySchools1 ACE School of CHARACTER Quality Mark Logo for light BGs (3) Csw logo investors in careers cmyk

Explore our

Admissions

View all of our admissions information

Explore our

Curriculum

See all of our school curriculum information

Explore our

Ofsted Report

Chesham Grammar School is rated outstanding in all categories

Explore our

Sixth Form

Find out more about our sixth form

Explore our

Alumni

Find out more about joining our Alumni

Explore our

Head's Newsletter

Read the Head's weekly Newsletter

Latest News

what's happening at Chesham Grammar

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...

SHARE THIS ARTICLE

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...

SHARE THIS ARTICLE

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...

SHARE THIS ARTICLE

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...

SHARE THIS ARTICLE

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...

SHARE THIS ARTICLE

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...

SHARE THIS ARTICLE

Load More News View All News

Latest Events

what's coming up at a glance

18thDecember

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

5thJanuary

Start of Spring Term for Whole School

30thJanuary

FoCGS Comedy Night

30thJanuary

Franklin House Charity Day

10thMarch

11thMarch

12thMarch

13thMarch

20thMarch

Load More Dates View all events

Latest Tweets

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
Thanks to staff and students for getting into the festive spirit for Christmas Jumper Day today. Well done to Shakespeare House for leading this. pic.twitter.com/7wduWvf8pA
Chesham Grammar School @CGSBucks
RT @CGSSport: U18 Hockey team had a fantastic first game yesterday. With Sophie and Megan controlling the middle and Evie and Anisa keeping…
Chesham Grammar School @CGSBucks
U18 Hockey team had a fantastic first game yesterday. With Sophie and Megan controlling the middle and Evie and Anisa keeping the width of the pitch, to help the forwards score goals! A great 6-1 win against RMS. Beth x4, Evie x1, Sophie x1. POM: Evie 🏑🏑 pic.twitter.com/itRkhAnG8g
Chesham Grammar School @CGSBucks
Just a reminder that we have our Shakespeare charity day tomorrow to raise money for Save The Children. Non-uniform with a Christmas jumper and lots of fun activities during the day. Thanks to Shakespeare House Captains.
Chesham Grammar School @CGSBucks
Well done to the Under 14 Girls Football team who battled tirelessly against Surbiton High School, the ESFA champions for the last two years. The girls were 2-1 down with 15 minutes to play but couldn’t find that elusive equaliser, conceding a few goals. PoM: Isabelle S pic.twitter.com/W5C1k5txNm
Chesham Grammar School @CGSBucks
RT @CGSSport: U12A&B hockey teams played SWBGS and both teams winning! As won 2-1, Bs won 4-2. POMS: As Jemima, Bs Poppy. Well played girl…
Chesham Grammar School @CGSBucks