Sir Alan Howard Cottrell, FRS (born 17 July 1919) is a British metallurgist and physicist. He received his BSc degree from the University of Birmingham in 1939 and a PhD for research on welding in 1942. He joined the staff as a lecturer at Birmingham, being made professor in 1949, and transforming the teaching of the department by emphasizing modern concepts of solid state physics. In 1955 he moved to A.E.R.E. Harwell, to become Deputy Head of Metallurgy under Monty Finniston.