| Type | Other independent school |
| Phase | Secondary |
| Gender | Mixed |
| Age Range | 11 - 18 |
| Headteacher | Mr Barry Mansfield |
| Address |
33 Seymour Place London W1H 5AU |
| Religious Character | None |
| Website | http://www.halcyonschool.com |
| Telephone | 2072581169 |
| Number of pupils | 176 |
| Inspection | Outstanding |
| Local authority | Westminster |
| Region | London |
| URN | 139415 |
| View this school information in GOV.UK website | |