"Lean On" is a song recorded by American electronic music group Major Lazer and French producer DJ Snake, taken from the former's third studio album, Peace Is the Mission (2015), featuring vocals from Danish singer MØ. It was produced by Major Lazer and DJ Snake, and written by MØ, Major Lazer member Diplo, and DJ Snake. "Lean On" was released through Mad Decent independently (Because Music for Europe, WMG for Australia) as the lead single from the album on March 2, 2015. It is a dance and electronic song being also described as a house ballad.

"Lean On" was a critical and commercial success, peaking at number four on the US Billboard Hot 100 and at number two on the UK Singles Chart. It reached number one in several other countries including Australia, Ireland, the Netherlands, Mexico, New Zealand, Finland, Denmark and Switzerland. In November 2015, "Lean On" was named by Spotify as the most streamed song of all time, and has over 968 million streams globally as of April 2017; however it has since been overtaken by Drake's "One Dance" (2016).

The accompanying music video for "Lean On" was filmed in ND Studios, Karjat (India), Kaul Heritage City, Vasai in Maharashtra (India). The video premiered on March 23, 2015 and has over 1.9 billion views on YouTube as of April 2017. According to IFPI, "Lean On" was the fifth best selling song of 2015 worldwide, and one of the best-selling singles of all time, with global sales of 13.1 million.

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