Whodunnit? is an American murder mystery-based reality television show broadcast on ABC. The series premiered on June 23, 2013, and concluded its first season on August 18, 2013. The series was not renewed for a second season. The series is hosted by Gildart Jackson, who plays the mansion's butler, Giles.

In each episode, the competitors witness a "murder" (staged by production) committed secretly by one of their numbers, and are instructed to find clues to how the murder was done and the identity of the murderer. Players are privately quizzed on how well they have deduced the mystery; the player with the lowest score becomes the next victim of the murderer, eliminating them from the game.