The actor was perhaps most famous for his role as Violet Beauregard's father in Willy Wonka and the Chocolate Factory, opposite Gene Wilder in 1971.
One of his most famous lines in the movie was: "Violet, you're turning Violet!"
Stone was a prolific character actor who appeared in over 120 television shows and 35 films.
He appeared as Judge Paul Hanson in L.A. Law, and also starred in episodes of Lost in Space and M*A*S*H*.
Stone appeared as a non-celebrity contestant on Wheel of Fortune in 2000, and won $4,250 in cash and a trip to Bermuda.
He died on Wednesday after a short battle with cancer, his representative told TMZ.
Watch Leonard Stone in Willy Wonka and the Chocolate Factory below: