Carrie Marie Underwood (born March 10, 1983) is an American singer, songwriter, record producer, fashion designer, author and actress. She rose to prominence after winning the fourth season of American Idol, in 2005. Her debut single, "Inside Your Heaven", made her the only country artist to debut at number one on 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 huge crossover success of the singles "Jesus, Take the Wheel" and "Before He Cheats", becoming the best-selling solo female debut album in country music history, the fastest-selling debut country album in Nielsen SoundScan history and the best-selling country album of the last 17 years. Underwood won three Grammy Awards for the album, including Best New Artist.

Her second album, Carnival Ride, followed in 2007. It had one of the biggest opening weeks of all time by a female artist and won two Grammy Awards. Her next album, 2009's Play On, was a commercial success led by the single "Cowboy Casanova". Underwood's fourth album, Blown Away (2012), earned her a Grammy Award and was that year's second best-selling release by a female artist. Her first compilation album, Greatest Hits: Decade #1 (2014), was a chart and sales success that spawned the Grammy Award-winning crossover single "Something in the Water". Her fifth 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.

Underwood has sold 70 million records worldwide. She is the sixth highest-certified female artist of all time on the RIAA's Top Artists (Digital Singles) ranking, the highest-certified country album artist to debut in the twenty-first century and the woman with the most number-one singles on the Billboard Country Airplay chart, with 15. Her accolades include seven Grammy Awards, 11 Billboard Music Awards, 15 American Music Awards, a Guinness world record and inductions into the Hollywood Walk of Fame and the Grand Ole Opry. Billboard named her the top female country artist of both the 2000s and 2010s, and Some Hearts the top country album of the 2000s. She ranks, as per Pollstar, among the thirteen all-genre top female touring artists of the twenty-first century, selling over 4.3 million concert tickets. Acclaimed by Rolling Stone as "the female vocalist of her generation of any genre", she was listed by Time as one of the 100 most influential people in the world in 2014. Forbes has declared her the most successful American Idol winner. She has further ventured into fashion—creating a fitness clothing line named CALIA by Carrie in 2015, and into writing—releasing the New York Times best-selling fitness/lifestyle book Find Your Path in 2020.