| LA_code | 213 |
| LA_name | Westminster |
| EstablishmentNumber | 6001 |
| EstablishmentName | Halcyon London International School |
| TypeOfEstablishment | Other independent school |
| EstablishmentStatus | Open |
| PhaseOfEducation | Not applicable |
| StatutoryLowAge | 11 |
| StatutoryHighAge | 18 |
| Boarders | No boarders |
| NurseryProvision | No Nursery Classes |
| OfficialSixthForm | Has a sixth form |
| Gender | Mixed |
| ReligiousCharacter | None |
| ReligiousEthos | None |
| Diocese | Not applicable |
| AdmissionsPolicy | Not applicable |
| TrustSchoolFlag | Not applicable |
| Trusts | |
| SchoolSponsorFlag | Not applicable |
| SchoolSponsors | |
| FederationFlag | Not applicable |
| Federations | |
| UKPRN | 10040842 |
| FurtherEducationType | Not applicable |
| Street | 33 Seymour Place |
| Locality | |
| Address3 | |
| Town | London |
| County | |
| Postcode | W1H 5AU |
| SchoolWebsite | www.halcyonschool.com |
| TelephoneNum | 02072581169 |
| HeadTitle | Mr |
| HeadFirstName | Barry |
| HeadLastName | Mansfield |
| Linkedestablishments |