Reginald James (Reg) Bartley (died 16 January 1982) was a businessman, company director and Lord Mayor of Sydney in 1943–1944 and 1946–1948. He was succeeded by Ernest Charles O'Dea. A Civic Reform Association member, Bartley was attacked by a member of the Communist Party of Australia over a proposal to demolish "Maramonah", a mansion in central Sydney, inhabited by 600 squatters, in order to build a park. Bartley's plan was eventually taken up, and the site of the mansion is now a park in King's Cross. Bartley later said that he regretted the incident had become one between "communists and lawful authority".
In March 1946 Bartley was instrumental in moving to demolish the Sydney Mint and the Hyde Park Barracks, stating that they should "make way for modern structures".
Bartley's service to the City of Sydney is commemorated by the naming of Reg Bartley Oval at Rushcutters Bay and Bartley Street, Chippendale. The City of Sydney Florence Bartley Library was named in honour of Bartley's wife and Lady Mayoress Florence.