Sebastian
- Sal: 1968
- Welat: United Kingdom
- Genre: Drama, Romance, Comedy
- Studio: Paramount Pictures, Paramount British Pictures
- Keyword: london, england, spy, mathematician, british secret service, cryptologist
- Serek: David Greene
- Avdan: Dirk Bogarde, Susannah York, Lilli Palmer, John Gielgud, Janet Munro, Ronald Fraser