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The Cirencester branch line was a five-mile-long single-track branch railway line in Gloucestershire, England that connected Cirencester to the main line at Kemble. It was opened by the Cheltenham and Great Western Union Railway in 1841. The main line was extended from Kemble to a junction near Gloucester in 1845, by the GWR which had taken over the C&GWUR. The branch supported a busy passenger and goods business, but these declined in the 1930s, and closure was threatened in the 1950s. To reduce costs and maintain the viability of the line, lightweight four-wheel diesel railbuses were introduced, and they proved popular. Nevertheless, the line's decline was inexorable, passenger service closed in 1964 and the goods service ending the following year.
The route crossed the River Thames near its source and formed the highest rail crossing point on the river.