"Before He Cheats" is a song written by Chris Tompkins and Josh Kear and the third wide-release single from Carrie Underwood's debut studio album, Some Hearts (2005). It was the fifth release from the album overall. The song tells the story of a woman taking revenge on her potentially unfaithful boyfriend/husband.

The song became an enormous crossover success, topping the Billboard Hot Country Songs chart for five consecutive weeks, reaching the top five on the Billboard Adult Top 40 chart, and becoming a top ten hit on the Billboard Mainstream Top 40 and Adult Contemporary charts. On the Billboard Hot 100 chart, "Before He Cheats" reached number eight and achieved a longevity of 64 consecutive weeks on the chart, making it the sixth longest-charting single in the history of the Hot 100 chart.

"Before He Cheats" became the first ever country song to sell over two million digitally and was once the best-selling country song of all time. It had sold 4,312,000 digital downloads as of May 2016, and was once the best-selling song by an American Idol contestant but is now the third best-selling (behind Phillip Phillips' "Home" and Kelly Clarkson's "Stronger (What Doesn't Kill You)"). It has also been certified 5× Platinum by the RIAA, Underwood's largest-selling single to date.

The song has received a number of accolades. At the 50th Annual Grammy Awards, Underwood won the Grammy Award for Best Female Country Vocal Performance and the song's writers won the Grammy Award for Best Country Song. It received a nomination for the Grammy Award for Song of the Year as well. It was also named the 2007 Single of the Year by the Country Music Association Awards. It ranked on CMT's 40 Greatest Songs of the Decade at number 25, along with Underwood's other signature hit, "Jesus, Take the Wheel", which ranked number four.

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