Jonathan Bion "Jon" Provost (born March 12, 1950) is an American actor, best known for his role as young Timmy Martin in the CBS series Lassie.

Answer this question based on the passage: who played timmy in the tv series lassie? Okie... think carefully first, then make a decision:
This is the relevant information: Jonathan Bion "Jon" Provost (born March 12, 1950) is an American actor, best known for his role as young Timmy Martin in the CBS series Lassie. So, the answer is Jonathan Bion '' Jon '' Provost.