| School | HMC Division | Membership | Location | Age Range |
| Hurstpierpoint College | South East (UK) | British Isles | Hurstpierpoint, United Kingdom | 4 - 18 |
| Hutchesons’ Grammar School | Scottish (UK) | British Isles | Glasgow, United Kingdom | 3 - 18 |
| Hymers College | North East (UK) | British Isles | Hull, United Kingdom | 3 - 18 |
| Ibstock Place School | London (UK) | British Isles | Roehampton, London, United Kingdom | 4 - 18 |
| Immanuel College | London (UK) | British Isles | Bushey, Herts, United Kingdom | 4 - 18 |
| International British School of Bucharest | Associate (International) | București, Romania | 3 - 18 | |
| International School Lausanne, Switzerland | International | International | Le Mont-sur-Lausanne, Switzerland | 3 - 18 |
| Ipswich School | East (UK) | British Isles | Ipswich, United Kingdom | 3 - 18 |
| James Allen’s Girls’ School | London (UK) | British Isles | Dulwich, London, United Kingdom | 4 - 18 |
| Jerudong International School | International | International | Bandar Seri Begawan, Brunei Darussalam | 2 - 18 |
| JESS, Dubai | International | International | Dubai, United Arab Emirates | 3 - 18 |
| John Lyon School | London (UK) | British Isles | Harrow, London, United Kingdom | 3 - 18 |
| Jumeirah College, Dubai | International | International | Dubai, United Arab Emirates | 11 - 18 |
| Kellett School, The British International School in Hong Kong | International | International | Kowloon Bay, Hong Kong | 4 - 18 |
| Kelvinside Academy | Scottish (UK) | British Isles | Glasgow, United Kingdom | 3 - 18 |
| Kent College, Canterbury | South East (UK) | British Isles | Canterbury, United Kingdom | 11 - 18 |
| Kimbolton School | East (UK) | British Isles | Huntingdon, United Kingdom | 4 - 18 |
| King Edward VI School | South Central (UK) | British Isles | Southampton, United Kingdom | 11 - 18 |
| King Edward VI School, Stratford | South Central (UK) | Associate (UK) | Stratford-upon-Avon, United Kingdom | |
| King Edward’s High School for Girls | West (UK) | British Isles | Birmingham, United Kingdom | 11 - 18 |
| King Edward’s School (Bath) | South West and Wales (UK) | British Isles | Bath, United Kingdom | 3 - 18 |
| King Edward’s School (Witley) | South East (UK) | British Isles | Godalming, United Kingdom | 11 - 18 |
| King William’s College | North West (UK) | British Isles | Castletown, Isle of Man | 4 - 18 |
| King’s Bruton | South West and Wales (UK) | British Isles | Bruton, United Kingdom | 13 - 18 |
| King’s College (Taunton) | South West and Wales (UK) | British Isles | Taunton, United Kingdom | 13 - 18 |
| King’s College International School Bangkok | International | International | , Thailand | 3 - 18 |
| King’s College School, Wimbledon | London (UK) | British Isles | Wimbledon, London, United Kingdom | 7 - 18 |
| King’s College, Auckland | International | International | Auckland, New Zealand | |
| King’s College, The British School of Madrid | International | International | Madrid, Spain | 0 - 18 |
| King’s Ely | East (UK) | British Isles | Ely, United Kingdom | 2 - 18 |
| King’s School Rochester | South East (UK) | British Isles | Rochester, United Kingdom | 3 - 18 |
| Kingston Grammar School | London (UK) | British Isles | Kingston upon Thames, Surrey, United Kingdom | 11 - 18 |
| Kingswood School, Bath | South West and Wales (UK) | British Isles | Bath, United Kingdom | 11 - 18 |
| Kirkham Grammar School | North West (UK) | British Isles | Preston, United Kingdom | 3 - 18 |
| Kolej Tuanku Ja’afar | International | International | Mantin, Malaysia | 4 - 18 |
| Lady Eleanor Holles School | London (UK) | British Isles | Hampton, Richmond upon Thames, United Kingdom | 7 - 18 |
Hurstpierpoint College
Age range
4 - 18
Location
College Lane, Hurstpierpoint, West Sussex, BN6 9JS, United Kingdom
Head’s name
Dominic Mott
Hutchesons’ Grammar School
Age range
3 - 18
Location
21 Beaton Road, Glasgow, Scotland, G41 4NW, United Kingdom
Head’s name
Mark Ronan
Hymers College
Age range
3 - 18
Location
Hymers Avenue, Hull, HU3 1LN, United Kingdom
Head’s name
Justin Stanley
Ibstock Place School
Age range
4 - 18
Location
Clarence Lane, Roehampton, London, SW15 5PY, United Kingdom
Head’s name
Christopher Wolsey
Immanuel College
Age range
4 - 18
Location
Elstree Road, Bushey, Herts, WD23 4EB, United Kingdom
Head’s name
Daniel Endlar
International British School of Bucharest
Age range
3 - 18
Location
Strada Erou Iancu Nicolae 42, Bucharest, Voluntari, Romania
Head’s name
Kendall Peet
International School Lausanne, Switzerland
Age range
3 - 18
Location
Chemin de la Grangette 2, 1052 Le Mont-sur-Lausanne, Switzerland
Head’s name
Frazer Cairns
Ipswich School
Age range
3 - 18
Location
25 Henley Road, Ipswich, Suffolk, IP1 3SG, United Kingdom
Head’s name
Nick Gregory
James Allen’s Girls’ School
Age range
4 - 18
Location
144 East Dulwich Grove, London, SE22 8TE, United Kingdom
Head’s name
Alex Hutchinson
Jerudong International School
Age range
2 - 18
Location
Jalan Universiti, Bandar Seri Begawan BE 2119, Brunei Darussalam
Head’s name
Nicholas Sheehan
JESS, Dubai
Age range
3 - 18
Location
28 8 B St, Al Safa, Al Safa 1, Dubai, United Arab Emirates
Head’s name
Shane O'Brien
John Lyon School
Age range
3 - 18
Location
Middle Road, Harrow-on-the-Hill, HA2 0HN, United Kingdom
Head’s name
Rose Hardy
Jumeirah College, Dubai
Age range
11 - 18
Location
Al Wasl Road - Dubai - United Arab Emirates
Head’s name
Nick Brain
Kellett School, The British International School in Hong Kong
Head
Paul Tough
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Kellett School, The British International School in Hong Kong
Age range
4 - 18
Location
7 Lam Hing Street, Kowloon Bay, Hong Kong
Head’s name
Paul Tough
Kelvinside Academy
Age range
3 - 18
Location
33 Kirklee Road, Glasgow, Scotland, G12 0SW, United Kingdom
Head’s name
Daniel Wyatt
Kent College, Canterbury
Age range
11 - 18
Location
Kent College, Canterbury, CT2 9DT, United Kingdom
Head’s name
Mark Turnbull
Kimbolton School
Age range
4 - 18
Location
Kimbolton, Huntingdon, Cambridgeshire, PE28 OEA, United Kingdom
Head’s name
Will Chuter
King Edward VI School
Age range
11 - 18
Location
Wilton Road, Southampton, Hampshire, SO15 5UQ, United Kingdom
Head’s name
Neal Parker
King Edward VI School, Stratford
Age range
Location
Chapel Lane, Stratford-upon-Avon, Warwickshire, UK
Head’s name
Bennet Carr
King Edward’s High School for Girls
Age range
11 - 18
Location
Edgbaston Park Road, Birmingham, England, United Kingdom
Head’s name
Kirsty von Malaise
King Edward’s School (Bath)
Age range
3 - 18
Location
North Roadd, Claverton Down, Bath, BA2 6HU, United Kingdom
Head’s name
Martin Boden
King Edward’s School (Witley)
Age range
11 - 18
Location
Godalming, Surrey, GU8 5SG, United Kingdom
Head’s name
Joanna Wright
King William’s College
Age range
4 - 18
Location
Castletown, IM9 1TP, Isle of Man
Head’s name
Damian Henderson
King’s Bruton
Age range
13 - 18
Location
The Plox, Bruton, Somerset, BA10 OED, United Kingdom
Head’s name
Ian Wilmshurst
King’s College (Taunton)
Age range
13 - 18
Location
South Rd, Taunton, TA1 3LA, United Kingdom
Head’s name
Michael Sloan
King’s College International School Bangkok
Age range
3 - 18
Location
727 Ratchadaphisek Road, Bang Phong Phang, Yan Nawa, Bangkok, Thailand
Head’s name
Sarah Raffray
King’s College School, Wimbledon
Age range
7 - 18
Location
Southside, Wimbledon Common, London SW19 4TT, United Kingdom
Head’s name
Anne Cotton
King’s College, Auckland
Age range
Location
Golf Avenue, Otahuhu 1640, Auckland, New Zealand
Head’s name
Simon Lamb
King’s College, The British School of Madrid
Age range
0 - 18
Location
Paseo de Los Andes 35, Soto de Vinuelas, Madrid, 28760, Spain
Head’s name
Christopher Ramsey
King’s Ely
Age range
2 - 18
Location
The Old Palace, Ely, Cambridgeshire, CB7 4EW, United Kingdom
Head’s name
John Attwater
King’s School Rochester
Age range
3 - 18
Location
Satis House, Rochester, Kent, ME1 1TE, United Kingdom
Head’s name
Ben Charles
Kingston Grammar School
Age range
11 - 18
Location
70 London Road, Kingston upon Thames, Surrey, KT2 6PY, United Kingdom
Head’s name
Stephen Lehec
Kingswood School, Bath
Age range
11 - 18
Location
Lansdown Road, Bath, BA1 5RG, United Kingdom
Head’s name
Andrew Gordon-Brown
Kirkham Grammar School
Age range
3 - 18
Location
Ribby Road, Preston, Lancashire, PR4 2BH, United Kingdom
Head’s name
Tallan Gill
Kolej Tuanku Ja’afar
Age range
4 - 18
Location
Kolej Tuanku Ja'afar, Mantin, Negeri Sembilan, 71700, Malaysia
Head’s name
Glenn Moodie
Lady Eleanor Holles School
Age range
7 - 18
Location
102 Hanworth Road, Hampton, Middlesex, TW12 3HF, UK
Head’s name
Rowena Cole