"Roar" is a song by American singer Katy Perry for her fourth studio album, Prism (2013). It was released as the lead single from the record on August 10, 2013. Perry co-wrote the song with Bonnie McKee and its producers Dr. Luke, Max Martin, and Cirkut. It is a pop song containing elements of arena rock and lyrics centering on standing up for oneself and self-empowerment.

"Roar" received generally mixed reviews from music critics; many appreciated its overall production, while others felt that its lyrical content contained "clichés". The song was a commercial success, becoming Perry's eighth non-consecutive number one song on the U.S. Billboard Hot 100, and also topping charts in Australia, Canada, Ireland, New Zealand, and the United Kingdom. It also reached the top five in most international charts, including France, Germany, Italy, Japan, and Switzerland.

To promote the song, Perry performed under the Brooklyn Bridge at the closing ceremony of the 2013 MTV Video Music Awards, on The X Factor Australia, at the Sydney Opera House in late October 2013, and on the German TV show Schlag den Raab. Grady Hall and Mark Kudsi directed the song's music video, which features Perry trying to adapt to the jungle where she survived a plane crash, and taming a tiger. It garnered generally mixed reviews from music critics. "Roar" was nominated for Song of the Year and Best Pop Solo Performance at the 56th Annual Grammy Awards. The song topped the charts in 14 countries and, by the end of 2013, sold 9.9 million units (combined sales and track-equivalent streams) globally according to the IFPI. "Roar" has sold 6.4 million copies in the US, over 1 million in the UK, and 9.9 million copies worldwide.

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