The Worsted Viper is a 1943 detective novel by the British writer Gladys Mitchell.

[1] It is the fifteenth in her long-running series featuring the psychoanalyst and amateur detective Mrs Bradley.

[2] Bradley was one of a number of investigators active during the Golden Age of Detective Fiction.

In 2000 it was adapted for an episode of the television series The Mrs Bradley Mysteries starring Diana Rigg.

When three of her former students on a boating holiday in Norfolk discover a body in a cottage, they call in the assistance of Mrs Bradley.