Joslin is a surname. Notable people with the surname include:
David B. Joslin (born 1936), American bishop
Derek Joslin, Canadian professional ice hockey defenceman
Elliott P. Joslin (1869–1962), first doctor in the United States to specialize in the treatment of diabetes
Jeff Joslin, retired Canadian mixed martial artist
Les Joslin, former Australian cricketer
Margaret Joslin (1983–1956), American film actress
Murray Joslin (1901–1981), electrical engineer who made major contributions to nuclear power
Peter Joslin, former British police officer, Chieff Constable of Warwickshire Police and Deputy Lieutenant of Warwickshire
Phil Joslin (footballer) (1916–1980), English former professional footballer
Phil Joslin (referee), English association football referee
Raymond E. Joslin, American businessman and cable executive
Sesyle Joslin, children's author
Theodore Goldsmith Joslin, press secretary to President Herbert Hoover from 1931 to 1933
Isaac Joslin Cox (1873–1956), American professor of history
