The Marsham Towers were three towers at the corner of Marsham Street and Great Peter Street in Westminster, London. They served as the headquarters of the Department of the Environment.

The secretary of state for the environment was a UK cabinet position, responsible for the Department of the Environment (DoE). Today, its responsibilities are carried out by the Secretary of State for Environment, Food and Rural Affairs and the Secretary of State for Levelling Up, Housing and Communities. The post was created by Edward Heath as a combination of the Ministry of Housing and Local Government, the Ministry of Transport and the Ministry of Public Building and Works on 15 October 1970. Thus it managed a mixed portfolio of issues: housing and planning, local government, public buildings, environmental protection and, initially, transport – James Callaghan gave transport its own department again in 1976. It has been asserted that during the Thatcher government the DoE led the drive towards centralism, and the undermining of local government. Particularly, the concept of 'inner cities policy', often involving centrally negotiated public-private partnerships and centrally appointed development corporations, which moved control of many urban areas to the centre, and away from their, often left-wing, local authorities. The department was based in Marsham Towers, three separate tower blocks built for the separate pre-merger ministries, in Westminster.