"In Too Deep" is the fourth track on the 1986 Genesis album Invisible Touch. It was released as the second single from the LP in the UK and the fourth single in the U.S. The single was a huge success in America during the summer of 1987; it reached the number three spot on the U.S. Billboard Hot 100 chart, and the number one spot on the Adult Contemporary chart. The song is only performed live during the 1986 North American legs during the Genesis 1986/1987 Invisible Touch world tour. A 1987 performance of the song was included on the 1992 live album The Shorts.

"In Too Deep" is featured in the 2000 American crime/thriller American Psycho, as well as in the 1986 British neo-noir film Mona Lisa; for the latter the song won the "Most Performed Song from a Film" award at the BMI Film & TV Awards in 1988.

The lyric was written by Phil Collins after he was approached to write a song for the soundtrack of the movie Mona Lisa. The music is credited to the entire band in common with all the tracks on Invisible Touch.

The song went to number three on the Billboard Hot 100 in mid-1987, and number 19 on the British pop chart. "In Too Deep" also spent three weeks atop the American adult contemporary chart, also in mid-1987.

The music video for the song features the three band members playing on a minimalist set composed of steps and platforms. Tony Banks plays a grand piano, although the recording itself is mainly electric, while Mike Rutherford and Phil Collins mime acoustic guitar and vocals, respectively.

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