Eilleen Regina "Shania" Twain ( eye-LEEN ... shə-NY-ə; née Edwards; born August 28, 1965) is a Canadian singer-songwriter. She has sold over 100 million records, making her one of the best-selling music artists of all time and the best-selling female artist in country music history. Her success garnered her several titles, including the "Queen of Country Pop". Billboard named her as the leader of the '90s country-pop crossover stars.

Raised in Timmins, Ontario, Twain pursued singing and songwriting from a young age before signing with Mercury Nashville Records in the early 1990s. Her self-titled debut studio album was a commercial failure upon release in 1993. After collaborating with producer and later husband Robert John "Mutt" Lange, she rose to fame with her second studio album, The Woman in Me (1995), which brought her widespread success. It sold over 20 million copies worldwide, spawned eight singles, including "Any Man of Mine" and earned her a Grammy Award. Twain's third studio album, Come On Over (1997), is recognized by Guinness World Records as the biggest-selling studio album by a female solo artist. It also became the best-selling country album, best-selling album by a Canadian, and one of the world's best-selling albums of all time, selling over 40 million copies worldwide. Come On Over produced twelve singles, including "You're Still the One", "From This Moment On", "That Don't Impress Me Much" and "Man! I Feel Like a Woman!" and earned her four Grammy Awards. Her fourth studio album, Up! (2002), spawned eight singles, including "I'm Gonna Getcha Good!", "Ka-Ching!" and "Forever and for Always", selling over 20 million copies worldwide, also being certified Diamond in the United States.

In 2004, after releasing her Greatest Hits album, which produced three singles including "Party for Two", Twain entered a hiatus, revealing years later that diagnoses with Lyme disease and dysphonia led to a severely weakened singing voice. She chronicled her vocal rehabilitation on the OWN miniseries Why Not? with Shania Twain, released her first single in six years in 2011, "Today Is Your Day", and published an autobiography, From This Moment On. Twain returned to performing the following year with an exclusive concert residency at The Colosseum at Caesars Palace, Shania: Still the One, which ran until 2014. In 2015, she launched the North American Rock This Country Tour, which was billed as her farewell tour. Twain released her first studio album in 15 years in 2017, Now, and embarked on the Now Tour in 2018. In 2019, she started her second Las Vegas residency, Let's Go! at the Zappos Theater. Her sixth studio album Queen of Me was released in 2023, and she embarked on the Queen of Me Tour in the same year.

Twain has received five Grammy Awards, two World Music Awards, 39 BMI Songwriter Awards, inductions to Canada's Walk of Fame and the Hollywood Walk of Fame, as well as the Canadian Music Hall of Fame and Nashville Songwriters Hall of Fame. According to the RIAA, she is the only female artist in history to have three (consecutive) albums certified Diamond by the RIAA and is the seventh best-selling female artist in the United States. Altogether Twain is ranked as the 10th best-selling artist of the Nielsen SoundScan era. Billboard listed her as the 13th Greatest Music Video Female Solo Artist of all time (42nd overall). According to Billboard Boxscore, she is the highest-grossing female country touring artist with $421.1 million gross from her concert tours.