"Chasing the Sun" is a song recorded by American pop rock singer Hilary Duff. It was written by Colbie Caillat, Jason Reeves, and Toby Gad, the latter of whom also produced the track. It is Duff's first single released since departing from her previous label Hollywood Records in 2008, under her recording contract with RCA Records. Undecided between "Tattoo", "All About You" and "Chasing the Sun" as the album's lead single, Duff and the label eventually chose the latter as the first single, describing it as a "top-down, carefree, super catchy singalong song". The song is featured in a March of Dimes public service announcement.

The song received mostly positive reviews from music critics. Jason Scott at PopDust praised the song for "show[ing] a more mature side to the singer, without completely abandoning her roots." Michelle McGahan of PopCrush likewise appreciated the song's sonic references to the era that made Duff a star: "We love the retro feel of the tune, which totally takes us back to the late '90s/early 2000s with its bubblegum sound." Jeff Benjamin of the music network Fuse gave the single a more mixed review, in which he praised the arrangement and "feel-good" vibe but was less impressed with Duff's singing. "It's not the vocal performance of a lifetime," writes Benjamin, "but it is that same peppy singer so many kids fell in love with hearing on TV everyday in the early '00s."

Vulture writer Lindsey Weber was more critical in her brief review. Describing the song as sounding "like Paris Hilton doing Sheryl Crow karaoke," Weber found "Chasing the Sun" to be an unsatisfying comeback and wrote that she "hope[s] there's more to come." Carolyn Menyes at Music Times was complimentary of the song musically but also questioned the song's viability as a vehicle for Duff's return to pop stardom saying "[If] Duff is expecting to move forward in her career, she's going to have to stop looking back and make music with a little more edge."VH1 writer Christopher Rosa said "'Chasing the Sun' swaps the bubblegum kitsch of 'Metamorphosis' (2003) and nightclub naughtiness of 2007's 'Dignity' for a softer acoustic sound," but that the song "still honors Duff's knack for summery pop froth."

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