"I Ain't No Quitter" is a song by Canadian country-pop singer Shania Twain. It was released on May 2, 2005 to country radio and physically in Europe on July 12, 2005 as the third and final single from her first compilation album Greatest Hits (2004). Like mostly all of her discography at the time, the song was written by Twain and then-husband Robert John "Mutt" Lange, who also produced the track. "I Ain't No Quitter" lyrically is about Twain sticking around with an overconfident and brash man. The song is regarded as a fan favorite among Twain's discography.

Eilleen Regina "Shania" Twain 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.