Alan Ernest Leofric Chorlton (24 February 1874 – 6 October 1946) was a British mechanical engineer and Conservative Party politician, and was involved in the development of the internal combustion engine.
Chorlton was born in Audenshaw, Lancashire. He was educated privately and at the mechanical engineering department of Manchester Technical School. He served an apprenticeship at Mather and Platt's ironworks in Salford, while studying part-time at Victoria University, Manchester.
At the age of 24 he became a consulting engineer to Hubbard Textile Printing Works, St Petersburg, Russia. He returned to England and the Salford Iron Works where he rose to become general works manager and was largely responsible for redesigning the Mather-Reynolds pump manufactured at the plant.
In 1913 he moved to Ruston and Hornsby at Lincoln. During the First World War he was appointed Deputy Controller of Aero Engines at the Ministry of Munitions. In 1917 he was awarded a Telford Premium medal by the Institution of Civil Engineers, and was made a Commander of the Order of the British Empire for his wartime services. He was also awarded the Cross of an Officer of the Order of the Crown of Italy.