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

Katheryn Elizabeth Hudson, known professionally as Katy Perry, is an American singer, songwriter, and television personality. She is known for her influence on modern pop music and her camp style, being dubbed the "Queen of Camp" by Vogue and Rolling Stone. At 16, Perry released a gospel record titled Katy Hudson (2001) under Red Hill Records, which was commercially unsuccessful. She moved to Los Angeles at 17 to venture into secular music, and later adopted the stage name "Katy Perry" from her mother's maiden name. She recorded an album while signed to Columbia Records, but was dropped before signing to Capitol Records.