Wallace Shawn (born November 12, 1943) is an American voice actor, best known for his roles as Vizzini in The Princess Bride, the voice of Rex the dinosaur in Disney/Pixar's Toy Story, Grand Nagus Zek in Star Trek: Deep Space Nine, and being Blair Waldorf's step-dad on Gossip Girl.

He voiced Bertram in the Family Guy episodes "Emission Impossible", "Sibling Rivalry" and "The Big Bang Theory".