"Doughnut" is a song recorded by South Korean girl group Twice. It is the group's ninth Japanese maxi single, featuring three other tracks. It was pre-released for digital download and streaming on December 3, 2021, by Warner Music Japan as a single from their fourth Japanese studio album, Celebrate. The single and its B-side, "Wonderful Day", were physically released on December 15 in Japan.
"Doughnut" was produced by JYP Entertainment's in-house producer Woo S. Rhee "Rainstone", and was composed by Rainstone, Alexis Kesselman, Fingazz, and Francis. It is Twice's first ballad single in Japan and takes inspiration from the city pop genre. The lyrics, written by Lauren Kaori, are about "the hole left in your heart when you're missing a special person".
The single peaked at number 3 on Japan's Oricon Singles Chart and number 6 on the Billboard Japan Hot 100. It was also certified gold by the Recording Industry Association of Japan.
On October 15, 2021, shortly after the release of their first English single, "The Feels", and the announcement of their third Korean studio album, ', Twice's agency JYP Entertainment announced through a winter-themed teaser that the group would be releasing their ninth Japanese single, "Doughnut", on December 15. The song was pre-released digitally on December 3, with an accompanying music video. That same day, Twice performed the song on the Japanese television show Music Station. On December 15, the group held an online event to commemorate the release of the single, where they performed "Doughnut" and its B-side "Wonderful Day".
Credits adapted from CD single liner notes.