Theatre 625 is a British television drama anthology series, produced by the BBC and transmitted on BBC2 from 1964 to 1968. It was one of the first regular programmes in the line-up of the channel, and the title referred to its production and transmission being in the higher-definition 625-line format, which only BBC2 used at the time.

In the fictional European country of Amalia, the political interests of the British, American and Communist espionage communities are explored. Eschewing the action formula of its ITV contemporaries, the series dealt more politically oriented plots such as defections to the west, awakening "sleeper" agents and the leaking of official secrets.

When a government official disappears in the London tunnels, after several reports of missing people in the same location, Scotland Yard start to take the matter seriously, along with a couple who stumble into a victim by accident.

Mrs. Weekley starts an affair with a young writer named D.H. Lawrence.