In which movie does Robin Williams play a character named jack?

Robin Williams plays a character named Jack in several movies, but the most well-known one is probably "Jack" (1996).

However, he also plays a character named Jack in:

* "The Birdcage" (1996)

* "Dead Poets Society" (1989)

To give you a definitive answer, you'll need to provide more context about the specific movie you're thinking of.