"Bridge over Troubled Water" is a song by the American folk rock duo Simon & Garfunkel, released in January 1970 as the second single from their fifth studio album, Bridge over Troubled Water (1970). It was written by Paul Simon and produced by Simon, Art Garfunkel and Roy Halee.

"Bridge over Troubled Water" features lead vocals by Art Garfunkel and a piano accompaniment influenced by gospel music, with a "Wall of Sound"-style production. It was the last song recorded for the album, but the first completed.

The instrumentation, provided by the Wrecking Crew, was recorded in California, while Simon and Garfunkel's vocals were recorded in New York. Simon felt Garfunkel should sing solo, an invitation Garfunkel initially declined. Session musician Larry Knechtel performs piano, with Joe Osborn playing bass guitar and Hal Blaine on drums.