Jason Thomas Mraz (/məˈræz/; born June 23, 1977) is an American singer-songwriter and guitarist. He rose to prominence with the release of his debut studio album, Waiting for My Rocket to Come (2002), which spawned the single "The Remedy (I Won't Worry)" that peaked at number 15 on the Billboard Hot 100 chart. His second studio album Mr. A-Z (2005) peaked at number five on the Billboard 200.

His third studio album, We Sing. We Dance. We Steal Things. (2008), peaked at number 3 on the Billboard 200 and was certified four times Platinum by the Recording Industry Association of America (RIAA). The album's lead single, "I'm Yours", reached the top ten on the Billboard Hot 100, while spending a then-record 76 weeks on the Hot 100, and it was certified Diamond by the RIAA. The album also spawned the Grammy Award winning singles "Make It Mine" and "Lucky" with Colbie Caillat.

His fourth album, Love Is a Four Letter Word (2012), peaked at number two on the Billboard 200 and spawned the single "I Won't Give Up", which became his second top ten hit on the Hot 100. He went on to release the top ten albums Yes! (2014) and Know. (2018). After signing a three-album agreement with BMG in 2020, Mraz released the albums Look for the Good (2020) and Mystical Magical Rhythmical Radical Ride (2023).

Along with receiving two Grammy Award wins, Mraz is also the recipient of two Teen Choice Awards, a People's Choice Award, and the Hal David Songwriters Hall of Fame Award. As of July 2014, Mraz has sold over seven million albums, and over 11.5 million in digital singles.

In 2023, Mraz competed as a contestant on season 32 of Dancing with the Stars, finishing in second place, behind Xochitl Gomez.