“Sign o' the Times” is the lead single from American musician Prince's 1987 album of the same name. The song was originally intended for two separate Prince albums meant to be released in 1986, that were both shelved: Dream Factory and Crystal Ball. (Many of the tracks from both of these albums ended up on the album Sign o' the Times.) Prince sings and performs the entire track except for some backing vocals by then-girlfriend Susannah Melvoin, sister of Wendy, then a guitarist in The Revolution.

The song proved popular upon release, topping the R&B chart, and reaching number three on the Billboard Hot 100 and number 10 on the UK Singles Chart. In 2010 Rolling Stone ranked “Sign o' the Times” at number 304 on their list of the 500 Greatest Songs of All Time. The song is also included in The Rock and Roll Hall of Fame's 500 Songs that Shaped Rock and Roll.