Oona O'Neill Chaplin
- Birth Date
- 5/14/1925 - 9/27/1991
- Birth Place
- Hamilton, Bermuda
- Known For
- Acting

Oona O'Neill Chaplin, Lady Chaplin was the daughter of Nobel and Pulitzer-Prize-winning American playwright Eugene O'Neill and English-born writer Agnes Boulton, and the fourth and last wife of English actor and filmmaker Charlie Chaplin.

