Lockleaze is an area and council ward in the northern suburbs of the city of Bristol, England, 3 miles (5 km) north of the city centre, south of Filton, east of Horfield and west of Frenchay. Lockleaze is a residential area of social housing built on the western flank of Purdown on a north-south axis, that was initially separated from Horfield by the main Bristol to South Wales railway line. The suburb was developed immediately after World War II. Although much of the housing was owned by Bristol Corporation, some are now privately owned. The Lockleaze council ward was extended to include older Bristol council housing and the border with Horfield is the thoroughfare, Filton Avenue.