"Sugar, We're Goin Down" is a song by American rock band Fall Out Boy. "Sugar, We're Goin Down" was released to radio on April 5, 2005 as the lead single from their second album, From Under the Cork Tree (2005). With the music composed and all lyrics penned by bassist Pete Wentz, the single reached No. 8 on the US Billboard Hot 100, becoming Fall Out Boy's first top 10 hit and exploding the band into the mainstream, exposing them to a new audience. It spent five weeks in the top 10 and 20 weeks in the top 20 out of its 42 chart weeks before it was retired.

Two different CD singles were released with different B-sides, Part I with a green cover and Part II with a red cover. Blender ranked "Sugar, We're Goin Down" at number four on their "100 Greatest Songs of 2005" list and About.com placed the song at number three on their "Top 100 Pop Songs of 2005" list. It was also nominated for the Kerrang! Award for Best Single in 2006.

The song became the band's first two-million seller in July 2009, and as of February 2013, has sold 4,639,000 copies in the US. It was upgraded to a 4x Platinum certification by the Recording Industry Association of America (RIAA) in February 2015. On July 22, 2013, "Sugar, We're Goin Down" was certified Silver by the British Phonographic Industry (BPI) for 200,000 sales.

In 2009, Phoenix New Times writer Martin Cizmar wrote that Sugar, We're Goin Down was possibly "the most listened-to emo track of all time".

Wentz told Rolling Stone that he deliberately slurred the lyrics in the song's chorus to make it sound better, saying that he "was trying to do a straight punk song for fun" and adding, "I saw those lyrics and just kind of barked them out. But there was something about the rhythm of it, where I was like, 'Hmm, that actually might be too good for just a shitty punk song.'" During the writing of the song it went through thirty changes and then went back to the way it first started.

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