Rosie Thomas is an American singer-songwriter, originally from Michigan. It was through mutual friends that she met Trey Many and began playing shows with Velour 100. They recorded one EP together and played a few short tours, where she met Damien Jurado and Pedro the Lion. She then moved to Seattle to briefly attend Cornish College before deciding to focus on a solo recording career.

Thomas also performs as a stand-up comedian under the name Sheila Saputo.

Her appearance on the song "Parking Lot", from Damien Jurado's album Ghost of David, brought her to the attention of famed record label Sub Pop who signed her in 2000.

Her debut album When We Were Small was released on January 22, 2001. The album featured Eric Fisher (who Thomas met at Cornish College in Seattle) on guitar and keyboards and Andy Myers on drums. Fisher and Myers returned for 2003's follow-up Only with Laughter Can You Win.

She released her third album, If Songs Could Be Held, in 2005.

In March 2006, Thomas was invited by Toronto indie rock label Paper Bag Records to exclusively contribute to their See You on the Moon! compilation with her song "Faith's Silver Elephant".

In April 2006, Pitchfork erroneously announced that Thomas and American musician Sufjan Stevens were having a baby together, but were forced to print a retraction.Denison Witmer and Thomas later admitted it was an April Fools' prank.

Her album, These Friends of Mine, was released on December 12, 2006 through her own record label Sing-A-Long Records.

She released a holiday album called A Very Rosie Christmas in November 2008 through her own record label. Thomas also acted in the 2009 film Calvin Marshall and was the subject of the 2009 documentary All the Way from Michigan Not Mars.