"Good Girl" is a song by American country music recording artist Carrie Underwood. The song was written by Chris DeStefano, Ashley Gorley, and Underwood. It was released by Arista Nashville as the lead single from Underwood's fourth studio album, Blown Away (2012).

Underwood debuted the song in a live performance during the annual Country Radio Seminar (CRS) event in Nashville on February 23, 2012. The song was sent to country radio stations directly following the performance. It was made available for purchase as a digital download on February 23, 2012. "Good Girl" officially impacted country radio on February 27, 2012 and was officially released to Hot AC radio on April 23, 2012.

On January 25, 2012, Underwood announced on her official website that the new single will be released in February. She co-wrote the song with Chris DeStefano and Ashley Gorley. Gorley has previously worked with Underwood on her singles "Don't Forget to Remember Me" and "All-American Girl."

"Good Girl" is about Underwood warning a good girl about her ex-boyfriend, saying that he is actually no good, and that she is better off without him.

The song is in C minor, with an approximate tempo of 126 beats per minute. It does not use full chords, but rather a pattern of open fifths consisting of C5-F5-E♭5-B♭5. Underwood's vocal ranges from G3 to F5.

Upon its release, "Good Girl" received general acclaim. Roughstock gave the song four stars and praised that "this is the best uptempo vocal that Carrie Underwood has given country radio.". Bill Lamb of About.com gave the song four out of five stars, noting that the song "crackles with rock guitar and vocal fireworks while encouraging audience participation with a singalong chorus that is pure pop." Bill Dukes of Taste of Country rated the song four and a half stars, saying, "By the third spin her confidence, energy and sheer talent will seduce you into believing every eight-note couldn’t be more perfectly placed." Kevin John Coyne of Country Universe gave the song a grade A and called it "an absolutely exhilarating record".

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