Guildford Road is a major road in Perth, Western Australia, linking the inner-city suburb of Mount Lawley with Guildford in the north-east. The ten-kilometre-long (6.2 mi) road runs mostly parallel to the Swan River, on its northern side, and is part of State Route 51, which runs between Perth's CBD and Midvale. Guildford Road is maintained and controlled by Main Roads Western Australia, which uses the internal designation "H026 Guildford Road" for Guildford Road, as well as Bridge Street and James Street in Guildford. In the 1930s, the name Great Eastern Highway was coined to describe the road, but was actually used for the road on the other side of the Swan River.