Leech is an English surname, originally denoting a physician (in reference to the medical practice of bloodletting). Notable people with the surname include:
Allen Leech (born 1981), Irish stage, television and film actor Andrew Leech (born 1952), English cricketer Faith Leech (1941–2013), Australian freestyle swimmer Fred Leech (1923–2001), English footballer Geoffrey Leech (1936–2014), specialist in English language and linguistics George L. Leech (1890–1985), American prelate of the Roman Catholic Church George Leech (actor) (1921–2012), British actor and stunt performer Gwyneth Leech, American artist Haliburton Hume Leech (1908–1939), Royal Air Force aviator, air racer and test pilot James Russell Leech (1888–1952), Republican member of the U.S. House of Representatives from Pennsylvania
Kenneth Leech (1939–2015), Anglican priest and Christian socialist Noyes Leech (1921–2010), American law professor at the University of Pennsylvania Law School Margaret Leech (1893–1974), American historian and fiction writer Michelle Leech, Australian academic clinician-scientist and rheumatologist Richard Leech (1922–2004), Irish actor Richard Leech (tenor) (born 1957), American operatic tenor Ryan Leech (born 1979), Canadian trials mountain bike rider Samuel Leech (1798–1848), sailor in the Royal Navy and the United States Navy during the War of 1812 William John Leech (1881–1968), Irish painter