"Man Down" is a song by Barbadian singer Rihanna from her fifth studio album, Loud (2010). Singer Shontelle and production duo Rock City wrote the song with its main producer, Sham. They wrote it during a writing camp, in Los Angeles of March 2010, held by Rihanna's record label to gather compositions for possible inclusion on the then-untitled album. Rock City were inspired by Bob Marley's 1973 song "I Shot the Sheriff" and set out to create a song which embodied the same feel, but from a female perspective. "Man Down" is a reggae murder ballad which incorporates elements of ragga and electronic music. Lyrically, Rihanna is a fugitive after she shoots a man, an action she later regrets. Several critics singled out "Man Down" as Loud's highlight, while others commented on her prominent West Indian accent and vocal agility.

Def Jam released "Man Down" on May 3, 2011, as the fifth single from the album. In the United States, the single reached number 59 on the Billboard Hot 100 and number 9 on the Hot R&B/Hip-Hop Songs chart. It has been certified double platinum by the Recording Industry Association of America (RIAA). The song topped the chart in France for five consecutive weeks and reached the top three in Belgium and the Netherlands. Anthony Mandler directed its music video, in which Rihanna's character shoots a man after he rapes her. The video was criticized by the Parents Television Council, Industry Ears and Mothers Against Violence, who faulted Rihanna for suggesting that murder is an acceptable form of justice for rape victims. However, actress Gabrielle Union, a rape victim, praised the video for being relatable. "Man Down" was on the set list for three of Rihanna's tours – the Loud Tour (2011), the Diamonds World Tour (2013) and the Anti World Tour (2016).

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