"So Long Self" is a song written and performed by Christian rock band MercyMe. "So Long Self" is musically a song with a lyrical theme revolving around a figurative breakup with one's self. "So Long Self" was released as the lead single from the band's 2006 album Coming Up to Breathe.

"So Long Self" received positive reception from critics, who praised the song's lyrical hook. It was added by fifty-two Christian AC stations in its first chart week, a record for the Christian AC chart. The song had success on both Christian and mainstream radio, peaking at number one on the Christian Songs chart for four consecutive weeks; it also peaked at number sixteen on the Adult Contemporary chart. It was listed on Billboard magazine's 2006 year-end Christian Songs and Adult Contemporary charts.

Lead singer Bart Millard has described the story behind "So Long Self" as "...really simple: It’s Not About [humanity]. It never has been and it never will be. Just like when maybe you had to break up with a girlfriend or a boyfriend growing up, or maybe the same thing happened to you, the ultimate breakup in life is when we breakup with ourselves. Because Christ said you have to die to self to follow him". The song is also lyrically about a break-up with sinful human nature.

"So Long Self" was written and composed by MercyMe. It was recorded in Allaire Studios in Shokan, New York; overdubs were recorded in Oxford Sound in Nashville, Tennessee, while strings were recorded at Abbey Road Studios in London, England. "So Long Self" is a song with a length of four minutes and three seconds. The song is set in the key of E major and has a tempo of 144 beats per minute, with a vocal range spanning from B₃ to E₅. "So Long Self" features a guitar solo near the end of the song, and the bridge of the song features what has been described as Electric Light Orchestra-influenced vocals.

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