"Somethin' Bad" is a song recorded as a duet by American country music artists Miranda Lambert and Carrie Underwood. The song was written by Chris DeStefano, Brett James, and Priscilla Renea. It was released as the second single from Lambert's fifth studio album Platinum in advance of the album's release two weeks later. The song premiered at the 2014 Billboard Music Awards on May 18, 2014, and was released for sale the next day.

"Somethin' Bad" peaked at number one on the Billboard Hot Country Songs, becoming Underwood's thirteenth number one on the chart and Lambert's fifth. The song is the first number one by teamed-up solo women in more than two decades on this chart.

On December 5, 2014, the collaboration received a Grammy nomination for Best Country Duo/Group Performance.

The song was written by Chris DeStefano and Brett James along with Priscilla Renea while they were at a writing retreat in France for ASCAP. The song was originally intended to be a male/female duet, but was later tweaked so that it could be performed by two females.

The song is seen as a female take on the bro-country genre. According to Lambert, when she heard "Somethin’ Bad", "the song just popped," and it "really struck a chord." Lambert said she had wanted to do a duet with Carrie Underwood, and that "It's been too long since two girls in our genre have come together like that, especially on a song that's kind of in your face." She sent Underwood an email to request a collaboration, which was accepted as they had wanted to sing together for some time.

The song made its debut on the 2014 Billboard Music Awards on May 18, 2014 with a performance by Lambert and Underwood. They performed the song again at the CMT Music Awards on June 4, 2014.

The song received generally favorable response from the critics. Matt Bjorke of Roughstock thought the song playful, fun, and "sure to be a fast-selling hit." Jason Scott of AXS called it "a fun, beat-driven summer anthem" and rated it four stars out of five.Taste of Country said that the song's "ready-for-anything lyrics and the way that Lambert and Underwood belt them out with such power, make ‘Somethin’ Bad’ a catchy girl-power anthem."

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