Timlin is a surname. Notable people with the surname include:
Addison Timlin (born 1991), American actress Amy Timlin (born 1999), English professional boxer Andrew Timlin (born 1974), New Zealand field hockey player I.R. Timlin (1880–1955), American architect James Timlin (1927–2023), Catholic Bishop of Scranton Mark Timlin (born 1944), British author Michael Timlin (born 1985), English-born Irish international footballer Mike Timlin (born 1966), American Major League Baseball pitcher Robert Timlin (1932–2017), American jurist, Senior District Judge for the Central District of California Thomas F. Timlin (1863–1903), American politician, member of the Wisconsin State Assembly William H. Timlin (1852–1916), American jurist William M. Timlin (1892–1943), South African architect and illustrator