Cirencester Watermoor railway station was on the Midland and South Western Junction Railway (M&SWJR) in the town of Cirencester in Gloucestershire, England. The station opened on 18 December 1883, as the terminus of the Swindon and Cheltenham Extension Railway line from Swindon Town. That line then amalgamated with the Swindon, Marlborough and Andover Railway to form the M&SWJR. Cirencester became a through-station in 1891, with the opening of the northern extension of the line between Cirencester and the junction at Andoversford with the Great Western Railway (GWR)'s Cheltenham Lansdown to Banbury line, which had opened in 1881.