| School | HMC Division | Membership | Location | Age Range |
| Rossall School | North West (UK) | British Isles | Fleetwood, United Kingdom | 2 - 18 |
| Rougemont School | South West and Wales (UK) | British Isles | Newport, United Kingdom | 3 - 18 |
| Royal Grammar School (Guildford) | South Central (UK) | British Isles | Guildford, United Kingdom | 11 - 18 |
| Royal Grammar School High Wycombe | South Central (UK) | Associate (UK) | High Wycombe, United Kingdom | |
| Royal High School Bath | South West and Wales (UK) | British Isles | Bath, United Kingdom | 3 - 18 |
| Royal Hospital School | East (UK) | British Isles | Ipswich, United Kingdom | 11 - 18 |
| Royal Masonic School for Girls | London (UK) | British Isles | Rickmansworth, United Kingdom | 2 - 18 |
| Royal Russell School | London (UK) | British Isles | Croydon, London, United Kingdom | 3 - 18 |
| Rugby School | West (UK) | British Isles | Rugby, United Kingdom | 13 - 18 |
| Rugby School Japan | International | Associate (International) | Kashiwa, Japan | 11 - 18 |
| Ryde School | South Central (UK) | British Isles | Ryde, United Kingdom | 2 - 18 |
| Scarborough College | North East (UK) | British Isles | Scarborough, United Kingdom | 3 - 18 |
| Seaford College | South Central (UK) | British Isles | Petworth, United Kingdom | 6 - 18 |
| Sedbergh School | North East (UK) | British Isles | Sedbergh, United Kingdom | 13 - 18 |
| Sevenoaks School | South East (UK) | British Isles | Sevenoaks, United Kingdom | 11 - 18 |
| Sherborne Girls | South West and Wales (UK) | British Isles | Sherborne, United Kingdom | 11 - 18 |
| Sherborne School | South West and Wales (UK) | British Isles | Sherborne, United Kingdom | 13 - 18 |
| Shiplake College | South Central (UK) | British Isles | Oxon, United Kingdom | 11 - 18 |
| Shrewsbury International School Bangkok | International | International | Bangkok, Thailand | 2 - 18 |
| Shrewsbury School | West (UK) | British Isles | Shrewsbury, United Kingdom | 11 - 18 |
| Sidcot School | South West and Wales (UK) | British Isles | Winscombe, United Kingdom | 3 - 18 |
| Sir William Perkins’s School | London (UK) | British Isles | Chertsey, Surrey, United Kingdom | 11 - 18 |
| Solihull School | West (UK) | British Isles | Solihull, United Kingdom | 3 - 18 |
| South Hampstead High School | London (UK) | British Isles | Hampstead, London, United Kingdom | 4 - 18 |
| St Albans High School for Girls | London (UK) | British Isles | St Albans, United Kingdom | 4 - 18 |
| St Albans School | London (UK) | British Isles | St Albans, United Kingdom | 11 - 18 |
| St Aloysius’ College | Scottish (UK) | British Isles | Glasgow, United Kingdom | 3 - 18 |
| St Andrew’s Cathedral School | International | Associate (International) | Sydney, Australia | 3 - 18 |
| St Andrews Turi | International | International | Molo, Kenya | 3 - 18 |
| St Bede’s College | North West (UK) | British Isles | Manchester, United Kingdom | 3 - 18 |
| St Benedict’s School | London (UK) | British Isles | Ealing, London, United Kingdom | 3 - 18 |
| St Catherine’s British School | International | International | Athens, Greece | 3 - 18 |
| St Christopher’s School | International | International | Isa Town, Kingdom of Bahrain | 3 - 18 |
| St Columba’s College, Dublin | Irish | British Isles | Dublin, Republic of Ireland | 12 - 18 |
| St Columba’s College, St Albans | London (UK) | British Isles | St Albans, United Kingdom | 4 - 18 |
| St Columba’s School, Kilmacolm | Scottish (UK) | British Isles | Kilmacolm, United Kingdom | 3 - 18 |
Rossall School
Age range
2 - 18
Location
Broadway, Fleetwood, Lancashire, FY7 8JW, United Kingdom
Head’s name
Jeremy Quartermain
Rougemont School
Age range
3 - 18
Location
Malpas Road, Newport, NP20 6QB, United Kingdom
Head’s name
Lisa Pritchard
Royal Grammar School (Guildford)
Age range
11 - 18
Location
Royal Grammar School, Guildford, Surrey, GU1 3BB, United Kingdom
Head’s name
Jonathan Cox
Royal Grammar School High Wycombe
Age range
Location
Amersham Road, High Wycombe, Buckinghamshire, HP13 6QT
Head’s name
Philip Wayne
Royal High School Bath
Age range
3 - 18
Location
Lansdown Road, Bath, BA1 5SZ, United Kingdom
Head’s name
Heidi-Jayne Boyes
Royal Hospital School
Age range
11 - 18
Location
Holbrook, Ipswich, Suffolk, IP9 2RX, United Kingdom
Head’s name
Irfan Latif
Royal Masonic School for Girls
Age range
2 - 18
Location
Rickmansworth Park, Rickmansworth, Hertfordshire, WD3 4HF, United Kingdom
Head’s name
Kevin Carson
Royal Russell School
Age range
3 - 18
Location
Coombe Lane, Croydon, London, CR9 5BX, United Kingdom
Head’s name
Christopher Hutchinson
Rugby School
Age range
13 - 18
Location
Lawrence Sheriff Street, Rugby, Warwickshire, CV22 5EH, United Kingdom
Head’s name
Gareth Parker-Jones
Rugby School Japan
Age range
11 - 18
Location
Kashiwanoha, Kashiwa, Chiba, Japan
Head’s name
Tony Darby
Ryde School
Age range
2 - 18
Location
Queen's Road, Ryde, Isle of Wight, PO33 3BE, United Kingdom
Head’s name
Will Turner
Scarborough College
Age range
3 - 18
Location
Filey Road, Scarborough, North Yorkshire, YO11 3BA
Head’s name
Guy Emmett
Seaford College
Age range
6 - 18
Location
Lavington Park, Petworth, West Sussex, GU28 0NB, United Kingdom
Head’s name
John Green
Sedbergh School
Age range
13 - 18
Location
Station Road, Sedbergh, Cumbria, LA10 5HG, United Kingdom
Head’s name
Dan Harrison
Sevenoaks School
Age range
11 - 18
Location
High Street, Sevenoaks, Kent, TN13 1HU, United Kingdom
Head’s name
Jesse Elzinga
Sherborne Girls
Age range
11 - 18
Location
Bradford Road, Sherborne, Dorset, DT9 3QN, United Kingdom
Head’s name
Ruth Sullivan
Sherborne School
Age range
13 - 18
Location
Abbey Road, Sherborne, Dorset, DT9 3AP, United Kingdom
Head’s name
Simon Heard
Shiplake College
Age range
11 - 18
Location
Shiplake, Henley-on-Thames, Oxon, RG9 4BW, United Kingdom
Head’s name
Tyrone Howe
Shrewsbury International School Bangkok
Age range
2 - 18
Location
1922 Charoenkrung Road, Wat Phraya Krai, Bang Kho Laem, Bangkok 10120, Thailand
Head’s name
Robert Millar
Shrewsbury School
Age range
11 - 18
Location
The Schools, Shrewsbury, Shropshire, SY3 7BA, United Kingdom
Head’s name
Leo Winkley
Sidcot School
Age range
3 - 18
Location
Oakridge Lane, Winscombe, North Somerset, BS25 1PD, United Kingdom
Head’s name
James Jones
Sir William Perkins’s School
Age range
11 - 18
Location
Guildford Road, Chertsey, Surrey, KT16 9BN, United Kingdom
Head’s name
Debbie Picton
Solihull School
Age range
3 - 18
Location
793 Warwick Road, Solihull, West Midlands, B91 3DJ, United Kingdom
Head’s name
Charles Fillingham
South Hampstead High School
Age range
4 - 18
Location
3 Maresfield Gardens, Hampstead, London, NW3 5SS, United Kingdom
Head’s name
Anna Paul
St Albans High School for Girls
Age range
4 - 18
Location
Townsend Avenue, St Albans, Hertfordshire, AL1 3SJ, United Kingdom
Head’s name
Amber Waite
St Albans School
Age range
11 - 18
Location
Abbey Gateway, St Albans, Herts, AL3 4HB, United Kingdom
Head’s name
Joe Silvester
St Aloysius’ College
Age range
3 - 18
Location
45 Hill Street, Glasgow, Scotland, G3 6RJ, United Kingdom
Head’s name
To be confirmed
St Andrew’s Cathedral School
Age range
3 - 18
Location
Gadigal Country, Sydney Square, Sydney NSW2000, Australia
Head’s name
Dr Julie McGonigle
St Andrews Turi
Age range
3 - 18
Location
Molo, Nakuru County, Kenya
Head’s name
Geert Simons
St Bede’s College
Age range
3 - 18
Location
Alexandra Park, Manchester, M16 8HX, United Kingdom
Head’s name
Maria Kemp
St Benedict’s School
Age range
3 - 18
Location
54 Eaton Rise, London, W5 2ES, United Kingdom
Head’s name
Joseph Smith
St Catherine’s British School
Age range
3 - 18
Location
Leoforos Venizelou 77, Lycovrissi, Athens, 141 23, Greece
Head’s name
Jon Perriss
St Christopher’s School
Age range
3 - 18
Location
PO Box 32052, Isa Town, Kingdom of Bahrain
Head’s name
Simon Watson
St Columba’s College, Dublin
Age range
12 - 18
Location
Whitechurch, Dublin 16, D16 CH92, Republic of Ireland
Head’s name
Mark Boobbyer
St Columba’s College, St Albans
Age range
4 - 18
Location
King Harry Lane, St Albans, Hertfordshire, AL3 4AW, United Kingdom
Head’s name
Karl Guest
St Columba’s School, Kilmacolm
Age range
3 - 18
Location
Duchal Road, Kilmacolm, Scotland, PA13 4AU, United Kingdom
Head’s name
Victoria Reilly