"Here We Go Again" is a song performed by American singer Demi Lovato. It was written by Isaac Hasson, Lindy Robbins and Mher Filian and produced by SuperSpy, for Lovato's second studio album of the same name. It was released as the album's lead single on June 23, 2009, through Hollywood Records. The song was the only single from Here We Go Again released in North America. "Here We Go Again" is a power pop song with guitar lines and pop hooks and the lyrics speak of the protagonist's on-off relationship with a hesitant boyfriend.

The song received positive reviews from critics, who praised its pop hook and made comparisons with works by Kelly Clarkson. "Here We Go Again" peaked at number 15 on the Billboard Hot 100 and became Lovato's first top 40 hit on the chart as a solo artist. The song was certified platinum by the RIAA in 2014. It also peaked at number 36 in New Zealand and in the lower region of the Canadian Hot 100.

Lovato released her debut studio album, Don't Forget, in September 2008. Shortly thereafter in January 2009, she had already begun writing material for her sophomore effort. The recording sessions for the album began in January 2009, right after filming from the first season of Sonny with a Chance. According to Lovato, the album's writing process was nearly finished in just two weeks. Unlike Don't Forget, Lovato did not collaborate with the Jonas Brothers for her second album as she wanted to see what her sound would be like without their input. "Here We Go Again" was written by Isaac Hasson, Lindy Robbins and Mher Filian, and produced by Hasson and Filian under the production name SuperSpy. The duo also co-wrote and produced the album track "U Got Nothin' on Me".

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