"Let's Go Crazy" is a 1984 song by Prince and the Revolution. It was the opening track on both his album and the film Purple Rain. The song was also notable for opening with a funeral-like organ solo with Prince giving the "eulogy" for "this thing called life". That eulogy ends with a distinctive drum machine pattern and then quickly becomes a full hard rock number with heavy guitar, bass and keyboards. The lyrics suggest to enjoy life while you can. The song concludes with a searing guitar solo leading to a traditional blues ending and the exclamation "Take me away!"

When released as a single, the song became Prince's second number-one hit on the Billboard Hot 100 and also topped the two component charts, the Hot R&B/Hip-Hop Songs and Hot Dance Club Play charts, as well as becoming a UK Top 10 hit.

"Let's Go Crazy" also works as a metaphor for the religious struggle against evil, with the "de-elevator" representing Satan.

The extended "Special Dance Mix" of the song was performed in a slightly edited version in the movie Purple Rain. It contains a longer instrumental section in the middle, including a solo on an apparently out-of-tune piano and some muddled lyrics, repeating the track's introduction.

The B-side was the extremely popular and lyrically controversial "Erotic City". In the UK, the song was released as a double A-side with "Take Me with U". "Erotic City" also featured on the UK 12" single.

"Let's Go Crazy" is one of Prince's most popular songs and is almost always a staple for concert performances, often seguing into other hits.