| School | HMC Division | Membership | Location | Age Range |
| Queenswood School | London (UK) | British Isles | Hatfield, United Kingdom | 11 - 18 |
| Radley College | South Central (UK) | British Isles | Oxon, United Kingdom | 13 - 18 |
| Ratcliffe College | East (UK) | British Isles | Leicester, United Kingdom | 3 - 18 |
| Reading Blue Coat School | South Central (UK) | British Isles | Reading, United Kingdom | 11 - 18 |
| Redmaids’ High School | South West (UK) | British Isles | Bristol, United Kingdom | 7 - 18 |
| Reed’s School | London (UK) | British Isles | Cobham. Surrey, United Kingdom | 11 - 18 |
| Reigate Grammar School | South East (UK) | British Isles | Reigate, United Kingdom | 11 - 18 |
| Rendcomb College | West (UK) | British Isles | Cirencester, United Kingdom | 3 - 18 |
| Repton School | West (UK) | British Isles | Repton, United Kingdom | 13 - 18 |
| RGS Worcester | West (UK) | British Isles | Worcester, United Kingdom | 11 - 18 |
| Robert Gordon’s College | Scottish (UK) | British Isles | Aberdeen, United Kingdom | 3 - 18 |
| Roedean School | South East (UK) | British Isles | Brighton, United Kingdom | 11 - 18 |
| Rossall School | North West (UK) | British Isles | Fleetwood, United Kingdom | 2 - 18 |
| Rougemont School | South West (UK) | British Isles | Newport, United Kingdom | 3 - 18 |
| Royal Grammar School (Guildford) | South Central (UK) | British Isles | Guildford, United Kingdom | 11 - 18 |
| Royal High School Bath | South West (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 |
| 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 School | South West (UK) | British Isles | Sherborne, United Kingdom | 13 - 18 |
| Sherborne School for Girls | South West (UK) | British Isles | Sherborne, United Kingdom | 11 - 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 (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 |
Queenswood School
Age range
11 - 18
Location
Shepherd's Way, Hatfield, Hertfordshire, AL9 6NS, United Kingdom
Head’s name
Jo Cameron
Radley College
Age range
13 - 18
Location
Abingdon, Oxon, Oxfordshire, OX14 2HR, United Kingdom
Head’s name
John Moule
Ratcliffe College
Age range
3 - 18
Location
Fosse Way, Leicester, Leicestershire, LE7 4SG, United Kingdom
Head’s name
Jonathan Reddin
Reading Blue Coat School
Age range
11 - 18
Location
Sonning Lane, Sonning, Reading, Berkshire, RG4 6SU, United Kingdom
Head’s name
Peter Thomas
Redmaids’ High School
Age range
7 - 18
Location
Westbury-on-Trym, Bristol, BS9 3AQ, United Kingdom
Head’s name
Paul Dwyer
Reed’s School
Age range
11 - 18
Location
Sandy Lane, Cobham KT11 2ES, United Kingdom
Head’s name
Mark Hoskins
Reigate Grammar School
Age range
11 - 18
Location
Reigate Road, Reigate, Surrey, RH2 0QS, United Kingdom
Head’s name
Shaun Fenton
Rendcomb College
Age range
3 - 18
Location
Rendcomb, Cirencester, Gloucestershire, GL7 7HA, United Kingdom
Head’s name
Robert Jones
Repton School
Age range
13 - 18
Location
The Hall, Repton, Derbyshire, DE65 6FH, United Kingdom
Head’s name
Mark Semmence
RGS Worcester
Age range
11 - 18
Location
Upper Tything, Worcester, Worcestershire, WR1 1HP, United Kingdom
Head’s name
John Pitt
Robert Gordon’s College
Age range
3 - 18
Location
Schoolhill, Aberdeen, Scotland, AB10 1FE, United Kingdom
Head’s name
Robin Macpherson
Roedean School
Age range
11 - 18
Location
Roedean Way, Brighton, BN2 5RQ, United Kingdom
Head’s name
Niamh Green
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 High School Bath
Age range
3 - 18
Location
Lansdown Road, Bath, BA1 5SZ, United Kingdom
Head’s name
Kate Reynolds
Royal Hospital School
Age range
11 - 18
Location
Holbrook, Ipswich, Suffolk, IP9 2RX, United Kingdom
Head’s name
Simon Lockyer
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
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 School
Age range
13 - 18
Location
Abbey Road, Sherborne, Dorset, DT9 3AP, United Kingdom
Head’s name
Dominic Luckett
Sherborne School for Girls
Age range
11 - 18
Location
Bradford Road, Sherborne, Dorset, DT9 3QN, United Kingdom
Head’s name
Ruth Sullivan
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
Jonathan Gillespie