Night Key is a 1937 American science fiction crime film starring Boris Karloff and released by Universal Pictures.

[1][2] The inventor of a burglar alarm attempts to get back at the man who stole the profits to his invention (Hinds) before he goes blind.

This film, along with Tower of London, The Climax, The Strange Door and The Black Castle, was released on DVD in 2006 by Universal Studios as part of The Boris Karloff Collection.

This DVD set contains the rerelease version of this film from Realart Pictures, Inc.

It also contains the rerelease version of the theatrical trailer The packaging for this DVD set erroneously indicates that this film has a running time of 78 minutes.