"Here It Goes Again" is an alternative rock/power pop song by OK Go, and is the third released single (the fifth including radio-only singles) from the album Oh No. It also appears on the compilation album Now 23. It was the band's only single to chart on the Billboard Hot 100, until "I Won't Let You Down" entered the Hot 100 in November 2014. Featuring the band dancing on treadmills, the video became a staple on YouTube; it was one of the most watched videos, with over 52 million views, until it was removed from their channel. In addition, the single peaked at #36 in the UK Singles Chart on October 1, 2006, hence marking their second UK Top 40 single and their third UK Top 75 single.

Its B-side, "The Lovecats", a cover of The Cure's single, was previously released on the band's Do What You Want EP and the single "A Million Ways". An alternate version was nicknamed "UK Surf".

Written by Damian Kulash Jr., the three-minute "Here It Goes Again" is set in common time at a "Moderately fast rock" tempo of 144 beats per minute. It is composed in the key of C major, with the vocal range spanning from C₄ to A₄. Kulash also sang and played the guitar in the original mix, which was produced by Tore Johansson with co-production done by Eric Drew Feldman, Howard Willing and Ken Sluiter. Andy Ross was another guitarist on the track and was keyboardist as well. Other instruments on the recording include drums performed by Dan Konopka and bass by Tim Nordwind. David Carlsson and Petter Lindgård were the song's engineer, with Jens Lindgård being the engineering assistant. Recorded at Gula Studion in Malmö, Sweden, it was mixed at The Village Recorder in Los Angeles by Dave Sardy, and finally mastered by Robert Vosgien at Capitol Mastering, also in Los Angeles.

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