The Super Bowl will also feature John Legend's rendition of "America the Beautiful." (Treshelle Edmond will perform both the National Anthem and "America the Beautiful" in American Sign Language.)
Both songs will be televised live on NBC prior to kickoff.
The Broadway production of If/Then took a weeklong hiatus Jan. 27-Feb. 1 in order to allow for Menzel's travel and performance schedule. The musical ends its Broadway run March 22. A national tour launches this fall in Denver.
Menzel is making her Super Bowl debut. Others who have performed the National Anthem at the Super Bowl include Renée Fleming, Alicia Keys, Billy Joel, Diana Ross, Neil Diamond, Whitney Houston, Harry Connick, Jr., Garth Brooks, Natalie Cole, Vanessa Williams, Luther Vandross, Cher, Faith Hill, Mariah Carey, Dixie Chicks, Beyoncé Knowles, Christina Aguilera and many more.
Katy Perry will headline the Pepsi Super Bowl XLIX Halftime Show. The pregame and halftime shows are an NFL Network Production and will be executive-produced by Ricky Kirshner.
Super Bowl's XLIX Patriots vs. Seahawks airs on NBC beginning at 6 PM ET; pregame festivities begin at 1 PM. Check local listings.