"Na Na Na (Na Na Na Na Na Na Na Na Na)" is a song by American rock band My Chemical Romance. It is the second track and first single from their fourth and final studio album, Danger Days: The True Lives of the Fabulous Killjoys.

According to lead vocalist Gerard Way, the band had struggled with the departure of drummer Bob Bryar and was dissatisfied with the progress of the sessions for their fourth studio album until the recording of "Na Na Na". A breakthrough was achieved once the chord progressions for the song were in place, with Way explaining,

"That's the moment where we said, 'This song changes everything. We're starting over right now. We're starting it over with [producer Rob] Cavallo, and we're doing it now'. Everything up to that point had felt like we had been in this kind of stasis, and as artists, stasis really equals death. So, it was so bad, the vibe wasn't good, and then 'Na Na' happened. And then, all of a sudden, there was this real, big intensity underneath us, and it was the momentum we needed to dig deep and record another album".

The song was not originally intended as a single, but due to the positive response to the album's teaser video, "Art is the Weapon", it was released and a full music video was shot.

"Na Na Na" was premiered on air September 22, 2010 via WRFF in Philadelphia, Zane Lowe on BBC Radio 1, and KROQ-FM in Los Angeles. The artwork was released on the band's website the next day. The song was released on September 28, 2010 in North America for purchase at online music stores and was released on November 8, 2010 in the United Kingdom. On the day the single was released in North America, a lyric video, which primarily literally depicts the words in the song, was released on YouTube.WWE named "Na Na Na" as the official theme song for the 2010 Tables Ladders & Chairs PPV.

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