"Ego" is a song recorded by American singer Beyoncé for the deluxe edition of her third studio album, I Am... Sasha Fierce (2008). The song was composed by Elvis Williams, Harold Lilly, and Beyoncé. "Ego" was officially remixed with additional vocals from hip hop artist, Kanye West. Initially planned to be released in January 2009 as the second urban single in the US along with the fourth US and third international single "Halo", the release of "Ego" was canceled and replaced by "Diva". "Ego" was later issued as the third urban single, and fifth overall single in the US on May 19, 2009, alongside the sixth US and fourth international single "Sweet Dreams".

I Am... Sasha Fierce is the third studio album by American singer-songwriter Beyoncé. It was released on November 12, 2008, by Columbia Records and Music World Entertainment.