"Dim All the Lights" is a song by American recording artist Donna Summer that bowed at #70 on 25 August 1979 and peaked at #2 on 10–17 November 1979 on the Billboard Hot 100. It was blocked from becoming the third number one hit from the album by "Heartache Tonight" by the Eagles the first week and "Still" by Commodores the next week. Taken from her Bad Girls album and produced by her longtime collaborator Giorgio Moroder with Pete Bellotte, the track combines Summer's trademark disco beats with a more soulful pop sound. This was the third Hot 100 top two single from the album and her sixth consecutive Hot 100 top five single.

Summer had released "Hot Stuff" and "Bad Girls" and, later, the "No More Tears (Enough Is Enough)" duet with Barbra Streisand, all of which reached position 1. "Dim All the Lights" was another massive hit for her, reaching number two on the US Billboard Hot 100 singles chart and number 29 on the UK Singles Chart. Like "Hot Stuff" and "Bad Girls" before, "Dim All The Lights" and "No More Tears" were simultaneously in the top three, but missed having the top two positions, on the Hot 100.

"Dim All the Lights" was Summer's only hit single that she wrote alone. She had originally intended to give the song to Rod Stewart but changed her mind. The song was nominated for Best Disco Recording at the 22nd Grammy Awards in 1980.

According to Billboard, the song is about sex.

The recording is remarkable for a sustained note held by Summer for about sixteen seconds.

The record's flip side, "There Will Always Be a You," also received some airplay and was charted as an album cut on some North American radio stations (notably CKLW in Windsor, Ontario, where it reached number two in October 1979; interestingly, "Dim All the Lights" never charted on that station).

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