Sir Leslie Patrick Abercrombie FRIBA was an English town planner. Educated at Uppingham School, Rutland, he was the brother of Lascelles Abercrombie, poet and literary critic. Sir Patrick was closely involved in the founding of the Council for the Preservation of Rural England (CPRE). After its formation in December 1926, he served as its Honorary Secretary. He is best known for the post-Second World War replanning of London and the Clyde Valley. He created the County of London Plan (1943) and the Greater London Plan (1944) which are commonly referred to as the Abercrombie Plan. With Robert H. Matthews, he produced the Clyde Valley Regional Plan (1946) that proposed the new towns of East Kilbride and Cumbernauld.