Larkin is the name of several different characters in the works by Agatha Christie:
- Larkin - a foreign agent in The Clocks
- Larkin - a baker in Mrs McGinty's Dead
- Mr Larkin - a retired Anglo-Indian judge in The Case of the Perfect Maid
- Mrs Larkin - wife of Mr Larkin
- Beryl Larkin - a wealthy widow in The Horses of Diomedes