"Mysterious Ways" is a song by Irish rock band U2. It is the eighth track from their 1991 album, Achtung Baby, and was released as the album's second single on 2 December 1991. The song began as an improvisation called "Sick Puppy", with the band liking only the bass part that bassist Adam Clayton composed. The band struggled to build a song from it, with vocalist Bono and producer Daniel Lanois arguing intensely during one songwriting session. The song's breakthrough came after guitarist the Edge began experimenting with the Korg A3 effects unit. "Mysterious Ways" features a danceable beat, funky guitar hook, and conga-laden percussion, as well as mystical lyrics by Bono about romance and women.

"Mysterious Ways" reached the top ten on the singles charts of several countries, including Canada and the band's native Ireland, where it went to number one. In the United States, the song topped the Billboard Modern Rock Tracks and Album Rock Tracks charts and peaked at number nine on the Billboard Hot 100. It received praise from critics after the release of Achtung Baby, many of whom called it one of the album's standout tracks and one that best illustrated the band's musical evolution on the album.

A music video for the song was filmed in Morocco and incorporated distorted images of Bono and a belly dancer, Morleigh Steinberg, who eventually married the Edge. "Mysterious Ways" made its live debut on the Zoo TV Tour in 1992, when performances were accompanied by an on-stage belly dancer. The group has continued to perform the song on subsequent tours.