The 2021 Sun Bowl was a college football bowl game played on December 31, 2021, with kickoff at 12:00 p.m. EST (10:00 a.m. local MST) and televised on CBS. It was the 87th edition of the Sun Bowl (after the 2020 edition was cancelled due to the COVID-19 pandemic), and was one of the 2021–22 bowl games concluding the 2021 FBS football season. Sponsored by Kellogg's Frosted Flakes breakfast cereal, the game was officially known as the Tony the Tiger Sun Bowl, after its mascot, Tony the Tiger.