"Undo It" is a song written by Carrie Underwood, Kara DioGuardi, Marti Frederiksen, and Luke Laird. It was made available to digital retailers on October 27, 2009, and was released as an official single on May 24, 2010. The song is the third single from Underwood's third studio album, Play On.

Underwood performed the song at the 2010 American Idol finale, as well as at the 2010 CMT Music Awards. "Undo It" has sold 1.6 million copies in the United States, making it the 7th biggest song of her career. It is also her first song to chart outside the US and Canada, peaking at Number 85 in the Australian Music Chart.

"Undo It" was ranked number 29 on Billboard's year-end charts for Top Country Songs.

Underwood told The Boot that the idea for the "Undo It" hook came accidentally. "The guys had their guitars and they were playing something kind of bluesy, and Kara's got such a great R&B sense about her," she said. "And I started, 'Na, na, na-ing' to whatever they were playing. And they were like, 'What if that was the hook?' I said, 'Aw, I don't know?' And before you knew it, we had 'Uh, uh, uh undo it.' I mean, who would have thought? How do you write that down on paper? It was something that it didn't take that long to write and it's so much fun to sing on stage, and people get into it."

The song has received generally mixed reviews from music critics. Juli Thanki of Engine 145 gave the song a thumbs-down, calling it "a third-rate tune from Kelly Clarkson’s reject pile" and saying that it had "deeply stupid lyrics." Roughstock critic Matt Bjorke rated the song two-and-a-half stars out of five, saying that it had "catchy repeatable lyrics" but concluded his review by saying "she can do so much better." In his review for Allmusic, Stephen Thomas Erlewine called the song "strained sassiness."Billboard critic Deborah Evans Price was more positive in her review, comparing it to the "vengeful Carrie persona" of "Before He Cheats" and saying that it had "crisp, compelling" production. Kevin John Coyne of Country Universe gave the song an A- calling Undo It a short, sweet, and undeniably catchy song which features both “We Will Rock You” drum riffs and twangy fiddle, as if those two things together are as natural as peanut butter and chocolate.

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