"That's My Girl" is a song recorded by American girl group Fifth Harmony. It was released on September 27, 2016, as the third and final single from the group's second studio album, 7/27 (2016). The song was written by Tinashe Kachingwe, Alexander Kronlund, and Lukas Loules, with the production being handled by Kronlund and Loules. A remixes EP was released in December 2016. It was the last single released by the group to include former member Camila Cabello before her departure in December 2016.

"That's My Girl" has a length for three minutes and twenty-four seconds. The song was co-written by R&B singer Tinashe, Alexander Kronlund and Lukas Loules and produced by Kronlund and Loules. It is in the key of F minor, and written in common time with a moderate tempo of 100 beats per minute. Lyrically the song expresses a message of female empowerment. Its instrumentation includes "brassy horns, heavy bass, and an electronic drumroll". The song opens with member Ally Brooke singing the first verse: "Who's been working so damn hard?/ You got that head on overload," before praising "that flawless body", accompanied by horn samples. Normani rap-sings in the bridge: "Destiny said it, you got to get up and get it/Get mad independent, don't you ever forget it."

While reviewing the album 7/27, Christopher R. Weingarten from Rolling Stone wrote "there's nothing here as good as 2014's "Boss" but "That's My Girl" bites its honking horns just fine and delivers a booming addendum to its empowering message".Digital Spy‘s Lewis Corner wrote, "That's My Girl' is basically the bolder, more fierce cousin of 'Worth It' with its strutting brass and a chorus powerful enough to launch a NASA mission.

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