"Nasty Girl" is a song written and composed by American musician Prince. The song was first recorded by his protégé girl group Vanity 6 in 1982, who charted at number one on the US Hot Dance Club Play chart with their version. Prince gave the songwriting credit to lead singer Vanity, although he was the writer and composer.Inaya Day recorded a hit cover version of the song in 2004 that reached number 9 in the UK Singles Chart. There have also been several other versions of this song.

"Nasty Girl" was originally recorded by Vanity 6 on the Warner Bros. Records label for their self-titled debut studio album Vanity 6. The song was produced by Prince and issued as the album's second single on September 24, 1982. Due to its explicit lyrics, "Nasty Girl" met with resistance on mainstream American radio, peaking within the US Bubbling Under Hot 100 Singles chart. It did, however, become a sizable hit on US R&B radio and it hit number one on the US Hot Dance Club Play chart for four weeks in November 1982. The song was knocked off the number one position by Prince's "1999". "Nasty Girl" reached number 7 on the Dutch singles chart in November 1982, and number 11 on the Belgian (Flanders) chart in December 1982. Lead singer Vanity, who later became a Christian preacher, subsequently denounced the song and told members of her congregation who listened to the song to "keep praying for the Holy Spirit".

In 2004, American singer Inaya Day recorded a cover version of "Nasty Girl" and her version became quite successful. It was released in Australia, peaking at number 18 and remaining on the chart for 11 weeks there and hit number 1 on the ARIA Club chart. It was released in the UK the same year, peaking at number 9 on the UK Singles Chart.

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