| Borough | Westminster |
| Postcode | W1H 5AU |
| Phase | Not applicable |
| School type | Other independent school |
| Gender | Mixed |
| Age range | 11–18 |
| Sixth form | Has a sixth form |
| Admissions | Not applicable |
| Religious character | N/A |
| Overall rating | Not yet rated |
| Director | Jeffrey Lippman |
| Phone | 02072581169 |
| Website | www.halcyonschool.com |
| Crime level | High crime area |