"I Know There's an Answer" is a song by American rock band the Beach Boys, taken from their 1966 album Pet Sounds. It was composed and produced by Brian Wilson in lyrical collaboration with bandmate Mike Love and the group's road manager Terry Sachen. The song was written as a reaction to Wilson's experiences with lysergic acid diethylamide (LSD), as he explained, "I had gotten into that kind of thing. I guess it just came up naturally."