The Middle Circle was a Great Western Railway service in London that operated from 1872 to 1905. The route was from the District Railway station at Mansion House to Earl's Court, then via the West London Railway to Latimer Road on to the Hammersmith & City Railway and then via the Metropolitan Railway to the City of London. Although not a complete circuit, it was one of several 'circle' routes around London that opened at the same time, such as the 'inner circle' that is today's Circle line. Trains would run once every 30 minutes. In 1900 the service was cut back to run from Earl's Court to Aldgate, and ended in 1905.