Timlin is a surname. Notable people with the surname include:
Addison Timlin (born 1991), American actress
Andrew Timlin (born 1974), New Zealand field hockey player
I.R. Timlin (1880–1955), American architect
James Clifford Timlin (born 1927), American prelate of the Roman Catholic Church
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, 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
