The Blue Lamp is a 1950 British police procedural film directed by Basil Dearden and starring Jack Warner as PC Dixon, Jimmy Hanley as newcomer PC Mitchell, and Dirk Bogarde as criminal Tom Riley.

The title refers to the blue lamps that traditionally hung outside British police stations (and often still do). The film became the inspiration for the 1955–1976 TV series Dixon of Dock Green, where Jack Warner continued to play PC Dixon until he was 80 years old (even though Dixon is murdered in the original film).

The screenplay was written by Ealing regular T. E. B. Clarke, who had been a war reserve constable. The film is an early example of the "social realism" films that emerged later in the 1950s and 1960s, sometimes using a partial documentary-like approach. There are also cinematic influences of the film noir genre, particularly in underworld scenes featuring Bogarde's Tom Riley, such as the pool rooms and in and around the theatre, making deliberate use of genre trademarks like slow moving low camera angles and stark lighting. The plot, however, follows a simple moral structure in which the police are the honest guardians of a decent society, battling the disorganised crime of a few unruly youths. The film was set in London, and partly shot on locations there.