Carrie Marie Underwood (born March 10, 1983) is an American singer who rose to prominence after winning the fourth season of American Idol in 2005. Underwood's single "Inside Your Heaven" made her the only country artist to debut atop the Billboard Hot 100 chart and the only solo country artist in the 2000s to have a number-one song on the Hot 100. Her debut album, Some Hearts (2005), was bolstered by the successful crossover singles "Jesus, Take the Wheel" and "Before He Cheats", becoming the best-selling solo female debut album in country music history. She won three Grammy Awards for the album, including Best New Artist. The next studio album, Carnival Ride (2007) had one of the biggest opening weeks of all time by a female artist and won two Grammy Awards. Her third studio album, Play On (2009), produced the single "Cowboy Casanova", which had one of the biggest single-week upward movements on the Hot 100.

She achieved the second best-selling release by a woman in 2012 and won a Grammy Award with her fourth album, Blown Away (2012). Her compilation Greatest Hits: Decade #1 (2014) spawned the crossover single "Something in the Water". Her fifth studio album, Storyteller (2015), made her the only country artist to have all first five studio albums reach either numbers one or two on the Billboard 200 chart. With her sixth album, Cry Pretty (2018), she became the only woman to top the Billboard 200 with four country albums and had the biggest week for any album by a woman in 2018. She released her first Christmas project, My Gift, in 2020, and first gospel collection, My Savior, in 2021. Her 2022 studio album, Denim & Rhinestones, marked a return to her country pop sound.

Underwood has sold 85 million records worldwide. She is the tenth highest-certified female artist and the highest-certified female country artist of all time on the RIAA's Top Artists (Digital Singles) ranking, also being the female artist with the most number-one entries (16) on the Billboard Country Airplay chart. Her accolades include eight Grammy Awards, 12 Billboard Music Awards, 17 American Music Awards, five Guinness World Records and inductions into the Hollywood Walk of Fame and the Grand Ole Opry. Billboard ranked her the top female country artist of the 2000s and 2010s, and Some Hearts the top country album of the 2000s. Rolling Stone applauded her as "the female vocalist of her generation in any genre", Time listed her as one of the 100 most influential people in the world in 2014 and Forbes declared her the most successful American Idol winner. Outside of music, Underwood has ventured into fashion and writing, releasing her fitness clothing line CALIA by Carrie in 2015 and the New York Times best-selling fitness and lifestyle book Find Your Path in 2020.