The Cooyar railway line was a branch line in the Darling Downs region of Queensland, Australia. The small town of Cooyar is about halfway to Kingaroy in the South Burnett Region. A plan to connect Kingaroy to the south via Cooyar did not eventuate and left Cooyar at the terminus of a branch line running from Oakey west of Toowoomba. It was opened on 28 April 1913 after previous stages to Kulpi and Peranga opened on 29 April 1912 and 4 November 1912 respectively. The line was partially closed beyond Acland on 1 May 1964, with the last segment closed on 8 December 1969.