| School | HMC Division | Membership | Location | Age Range |
| Brighton College Abu Dhabi | International | International | Abu Dhabi, United Arab Emirates | 3 - 18 |
| Bristol Grammar School | South West (UK) | British Isles | Bristol, United Kingdom | 4 - 18 |
| British International School Riyadh | International | International | Riyadh, Saudi Arabia | 3 - 18 |
| British School Jakarta, Indonesia | International | International | Jakarta, Indonesia | 3 - 18 |
| British School Muscat | International | International | Muscat, Sultanate of Oman | 3 - 18 |
| British School, Al Khubairat | International | International | Abu Dhabi, United Arab Emirates | 3 - 18 |
| Bromley High School | South East (UK) | British Isles | Bromley, United Kingdom | 4 - 18 |
| Bromsgrove School | West (UK) | British Isles | Bromsgrove, United Kingdom | 4 - 18 |
| Bryanston School | South West (UK) | British Isles | Blandford Forum, United Kingdom | 13 - 18 |
| Campbell College | Irish | British Isles | Belfast, United Kingdom | 3 - 18 |
| Campion School | International | International | Athens, Greece | 3 - 18 |
| Canford School | South Central (UK) | British Isles | Wimborne, United Kingdom | 13 - 18 |
| Caterham School | London (UK) | British Isles | Caterham, United Kingdom | 11 - 18 |
| Channing School | London (UK) | British Isles | Highgate, London, United Kingdom | 4 - 18 |
| Charterhouse | South East (UK) | British Isles | Godalming, United Kingdom | 13 - 18 |
| Cheadle Hulme School | North West (UK) | British Isles | Cheadle Hulme, United Kingdom | 3 - 18 |
| Cheltenham College | West (UK) | British Isles | Cheltenham, United Kingdom | 13 - 18 |
| Cheltenham Ladies’ College | West (UK) | British Isles | Cheltenham, United Kingdom | 11 - 18 |
| Chetham’s School of Music | North West (UK) | British Isles | Manchester, United Kingdom | 8 - 18 |
| Chigwell School | London (UK) | British Isles | Chigwell, United Kingdom | 4 - 18 |
| Christ College Brecon | South West (UK) | British Isles | Brecon, United Kingdom | 5 - 18 |
| Christ’s Hospital | South East (UK) | British Isles | Horsham, United Kingdom | 11 - 18 |
| Churcher’s College | South Central (UK) | British Isles | Petersfield, United Kingdom | 3 - 18 |
| City of London Freemen’s School | South East (UK) | British Isles | Ashtead, United Kingdom | 7 - 18 |
| City of London School | London (UK) | British Isles | City of London, London, United Kingdom | 10 - 18 |
| City of London School for Girls | London (UK) | British Isles | Barbican, London, United Kingdom | 7 - 18 |
| Claremont Fan Court School | London (UK) | British Isles | Esher, United Kingdom | 2 - 18 |
| Clayesmore School | South Central (UK) | British Isles | Blandford, United Kingdom | 13 - 18 |
| Clifton College | South West (UK) | British Isles | Bristol, United Kingdom | 0 - 18 |
| Clongowes Wood College | Irish | British Isles | Naas, Republic of Ireland | 12 - 18 |
| Cokethorpe School | South Central (UK) | British Isles | Witney, United Kingdom | 4 - 18 |
| Coleraine Grammar School | Irish | British Isles | Coleraine, United Kingdom | 11 - 18 |
| Colfe’s School | London (UK) | British Isles | Lewisham, London, United Kingdom | 11 - 18 |
| Collegiate School Bristol | South West (UK) | British Isles | Bristol, United Kingdom | 11 - 18 |
| Coventry School Foundation | West (UK) | British Isles | Coventry, United Kingdom | 3 - 18 |
| Cranleigh School | South East (UK) | British Isles | Cranleigh, United Kingdom | 13 - 18 |
Brighton College Abu Dhabi
Age range
3 - 18
Location
Box 129444, Abu Dhabi, Abu Dhabi, United Arab Emirates
Head’s name
Scott Carnochan
Bristol Grammar School
Age range
4 - 18
Location
University Road, Bristol, BS8 1SR, United Kingdom
Head’s name
Jaideep Barot
British International School Riyadh
Age range
3 - 18
Location
7693 Ibrahim Mubarak Said Ad Dusari, 2786, Riyadh 13241, Saudi Arabia
Head’s name
Helen Olds
British School Jakarta, Indonesia
Age range
3 - 18
Location
Bintaro Sektor 9, JI. Raya Jombang-Ciledug, Pondok Aren, Tangerang 15427, Jakarta, Indonesia
Head’s name
David Butcher
British School Muscat
Age range
3 - 18
Location
Box 1907, Ruwi 112, Sultanate of Oman
Head’s name
Kai Vacher
British School, Al Khubairat
Age range
3 - 18
Location
C9WP+XJW, Al Mushrif - W24-02, Abu Dhabi, United Arab Emirates
Head’s name
Mark Leppard
Bromley High School
Age range
4 - 18
Location
Blackbrook Lane, Bromley, Kent, BR1 2TW, United Kingdom
Head’s name
Emily Codling
Bromsgrove School
Age range
4 - 18
Location
Worcester Road, Bromsgrove, Worcestershire, B61 7DU, United Kingdom
Head’s name
Michael Punt
Bryanston School
Age range
13 - 18
Location
Blandford Forum, Dorset, DT11 0PX, United Kingdom
Head’s name
Richard Jones
Campbell College
Age range
3 - 18
Location
Belmont Road, Belfast, BT4 2ND, United Kingdom
Head’s name
Robert Robinson
Campion School
Age range
3 - 18
Location
PO Box 67484, Athens, GR 153 02, Greece
Head’s name
Mike Henderson
Canford School
Age range
13 - 18
Location
Canford Magna, Wimborne, Dorset, BH21 3AD, United Kingdom
Head’s name
Ben Vessey
Caterham School
Age range
11 - 18
Location
Harestone Valley Road, Caterham, Surrey, CR3 6YA, United Kingdom
Head’s name
Ceri Jones
Channing School
Age range
4 - 18
Location
The Bank, Highgate, London, N6 5HF, United Kingdom
Head’s name
Lindsey Hughes
Charterhouse
Age range
13 - 18
Location
Godalming, Surrey, GU7 2DJ, United Kingdom
Head’s name
Alex Peterken
Cheadle Hulme School
Age range
3 - 18
Location
Claremont Road, Cheadle Hulme, Cheshire, SK8 6EF, United Kingdom
Head’s name
Lee Richardson
Cheltenham College
Age range
13 - 18
Location
Bath Road, Cheltenham, Glos, GL53 7LD, United Kingdom
Head’s name
Nicola Huggett
Cheltenham Ladies’ College
Age range
11 - 18
Location
Bayshill Road, Cheltenham, Gloucestershire, GL50 3EP, United Kingdom
Head’s name
Eve Jardine-Young
Chetham’s School of Music
Age range
8 - 18
Location
Long Millgate, Manchester, M3 1SB, United Kingdom
Head’s name
Nicola Smith
Chigwell School
Age range
4 - 18
Location
High Road, Chigwell, Essex, IG7 6QF, United Kingdom
Head’s name
Damian King
Christ College Brecon
Age range
5 - 18
Location
Christ College, Brecon, Powys, LD3 8AF, United Kingdom
Head’s name
Gareth Pearson
Christ’s Hospital
Age range
11 - 18
Location
The Avenue, Horsham, West Sussex, RH13 0LJ, United Kingdom
Head’s name
Simon Reid
Churcher’s College
Age range
3 - 18
Location
Ramshill, Petersfield, Hampshire, GU31 4AS, United Kingdom
Head’s name
Simon Williams
City of London Freemen’s School
Age range
7 - 18
Location
Ashtead Park, Ashtead, Surrey, KT21 1ET, United Kingdom
Head’s name
Roland Martin
City of London School
Age range
10 - 18
Location
107 Queen Victoria Street, London, EC4V 3AL, United Kingdom
Head’s name
Alan Bird
City of London School for Girls
Age range
7 - 18
Location
St Giles' Terrace, London, EC2Y 8BB, United Kingdom
Head’s name
Jenny Brown
Claremont Fan Court School
Age range
2 - 18
Location
Claremont Drive, Esher, Surrey, KT10 9LY, United Kingdom
Head’s name
William Brierly
Clayesmore School
Age range
13 - 18
Location
Iwerne Minster, Blandford, Dorset, DT11 8LL, United Kingdom
Head’s name
Joanne Thomson
Clifton College
Age range
0 - 18
Location
32 College Road, Clifton, Bristol, BS8 3JH, United Kingdom
Head’s name
Tim Greene
Clongowes Wood College
Age range
12 - 18
Location
Clane, Naas, County Kildare, W91 DN40, Republic of Ireland
Head’s name
Christopher Lumb
Cokethorpe School
Age range
4 - 18
Location
Witney, Oxfordshire, OX29 7PU, United Kingdom
Head’s name
Damian Ettinger
Coleraine Grammar School
Age range
11 - 18
Location
23-33 Castlerock Road, Coleraine, County Londonderry, Northern Ireland, BT51 3LA, United Kingdom
Head’s name
David Carruthers
Colfe’s School
Age range
11 - 18
Location
Horn Park Lane, London, SE12 8AW, United Kingdom
Head’s name
Richard Russell
Collegiate School Bristol
Age range
11 - 18
Location
Bell Hill, Bristol, Avon, BS16 1BJ, United Kingdom
Head’s name
Jeremy McCullough
Coventry School Foundation
Age range
3 - 18
Location
15 Queen's Rd, Coventry, CV1 3EG, United Kingdom
Head’s name
Chris Staley
Cranleigh School
Age range
13 - 18
Location
Horseshoe Lane, Cranleigh, Surrey, GU6 8QQ, United Kingdom
Head’s name
Martin Reader