"The Lazy Song" is a song recorded by American singer-songwriter Bruno Mars for his debut studio album Doo-Wops & Hooligans (2010). It was serviced to contemporary hit radios in the United States on February 15, 2011 as the album's third single by Atlantic and Elektra. Development of "The Lazy Song" began while Bruno Mars, Philip Lawrence and Ari Levine were hanging around the studio and didn’t feel like working. Mars wrote the song in collaboration with singer-songwriter K'naan and his production team The Smeezingtons, who also produced the track. Musically, "The Lazy Song" has been described as borrowing "heavily from roots reggae", while lyrically it is an anthem to laziness.

"The Lazy Song" reached number four on the US Billboard Hot 100, while it topped the charts in Denmark and in the United Kingdom. It charted on most international markets within the top five. Cameron Duddy and Mars directed the accompanying music video, in which Mars hangs out with five dancers with monkey masks while jest around in his underwear. It has been certified three and four times platinum by the Recording Industry Association of America (RIAA) and by Music Canada (MC), respectively. Worldwide, it was one of the best selling digital singles of 2011 with sales of 6.5 million copies. Mars sung "The Lazy Song" on television shows such as American Idol and the french X-Factor. The single was performed on The Doo-Wops & Hooligans Tour (2010–12), and occasionally on the Moonshine Jungle Tour (2013–14).

"The Lazy Song" is one of the eleven songs composed and produced by The Smeezingtons for Mars' debut studio album Doo-Wops & Hooligans. In an interview with Sound on Sound, fellow Smeezington Ari Levine explained how they came up with the song "[It] was a very tough song to write, even though it is so simple. That song began one day when we were hanging around the studio and hadn’t written a song for a few days and we were kind of burnt out and didn’t feel like working. We felt lazy. 'K’naan' was in the studio with us, and the four of us suddenly came up with this idea." He added, "After that we had a really hard time getting the groove and the drums to sit right. Once you have one piece of the puzzle, like when you realise that a drum track is good, you can add other things in after that."

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