The person spoke on condition of anonymity because no announcement had been made. The official word is expected to come at an event in New York's Times Square on Sunday.
The NFL's regular season began Thursday, and the first full slate of games is Sunday.
Some recent halftime performers at the NFL's championship game were Madonna in 2012, The Black Eyed Peas with Usher and Slash in 2011, The Who in 2010, and Bruce Springsteen and the E Street Band in 2009.
Mars is one of pop music's top acts, with several No. 1 hits, including his most recent, "When I Was Your Man."
The 27-year-old singer-songwriter-producer was honored for best male video and choreography for "Treasure" at the MTV Video Music Awards last month.
Mars, who was born Peter Hernandez, released his platinum-selling debut, "Doo-Wops & Hooligans," in 2010, and released his second album, "Unorthodox Jukebox," last year. His hits include "Locked Out of Heaven," ''Just the Way You Are" and "Grenade."
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