Monsterpiece Theater is a recurring segment on the American version of the internationally acclaimed children's educational program Sesame Street. While using Muppet characters to act out educational principles, Monsterpiece Theater is also a parody of the similarly acclaimed PBS show Masterpiece Theatre.

Monsterpiece Theater is hosted by Alistair Cookie, who is Cookie Monster trying his best to look like Alistair Cooke. Similar segments, titled Mysterious Theater and parodying fellow PBS anthology Mystery!, are hosted by "Vincent Twice Vincent Twice", a parody of Vincent Price.