Vespers is an interactive fiction game written in 2005 by Jason Devlin that placed first at the 2005 Interactive Fiction Competition. It also won the XYZZY Awards for Best Game, Best NPCs, Best Setting, and Best Writing.

Set in a 15th century Italian monastery, it is chiefly a horror-themed morality game, where the player takes moral decisions, which then affect the ending. However, whilst playing the game, it isn't obvious that these are moral dilemmas, and the game actively encourages the player to take the evil path.