Ian Thornley is a Canadian rock guitarist, vocalist, and songwriter. He is best known for his band Big Wreck as well as Thornley, his solo project during the 2000s.

Big Wreck are a Canadian-American rock band formed by Ian Thornley and Brian Doherty in Boston, Massachusetts in 1992. The band was rounded out with David Henning and Forrest Williams. They disbanded in 2002 and Ian Thornley pursued a solo career with his own band Thornley. In 2010, Ian Thornley and Brian Doherty reunited for a cross-Canada tour, playing both Big Wreck and Thornley songs. In 2012, under the name Big Wreck, the band released their third studio album, Albatross. The band has since released the albums Ghosts in 2014, Grace Street in 2017, ...But For the Sun in 2019, and 7 in 2023.