The Plymouth to Yealmpton Branch was a Great Western Railway single track branch railway line in Devon, England, that ran from Plymstock to Yealmpton. The line was planned as part of a route to Modbury, but the scheme was cut back to Yealmpton; it opened in 1898, and the passenger train service ran from Plymouth Millbay, but road competition led to declining usage and the passenger service was withdrawn in 1930.
During heavy air raids in 1941 many Plymouth workers preferred to find accommodation outside the city, and in 1941 the passenger service was reinstated, transferring to Plymouth Friary as the terminal. This service ceased in 1947 and the goods service on the line finished in 1960.