"TT" is a song recorded by South Korean girl group Twice, the lead single of their third extended play (EP) Twicecoaster: Lane 1. The song was released on October 24, 2016 by JYP Entertainment and distributed by KT Music. It is written and composed by Sam Lewis and Black Eyed Pilseung respectively. The title "TT" refers to the emoticon used to express crying or sadness.

The Japanese version of "TT" was released as the lead single for their first Japanese compilation album, #Twice. Its accompany music video was released on June 21, 2017.

On October 10, 2016 JYP Entertainment announced Twice's comeback with the title track "TT" from their third EP Twicecoaster: Lane 1. The first teaser for the music video was unveiled on October 20, featuring a boy and a girl wearing Halloween costumes, followed by the second teaser on the 21st. It was released on October 24 as a digital download on various music sites.

A remix version titled "TT (Tak Remix)" was released on February 20, 2017 as a bonus track from Twice's special album Twicecoaster: Lane 2.

"TT" was produced by Black Eyed Pilseung, who also composed Twice's hit songs "Like Ooh-Ahh" and "Cheer Up", and arranged by Rado. It has lyrics written by Sam Lewis, which describes a girl's pounding heart as she falls in love for the first time. It is a pop song with heavy electronic influences and steady snare beats.

The music video for title track "TT" was directed by Naive, the same production team behind the music videos for Twice's songs "Like Ooh-Ahh" and "Cheer Up". It earned more than 5 million views on YouTube in less than 24 hours since its release. As of 2016, the video set a new record in only 40 hours, making it the fastest K-pop group music video to reach 10 million views and then broke the record of fastest to reach 20 million views in 114 hours (4 days 18 hours).

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