Sim is a surname, and may refer to:
Alastair Sim (1900–1976), Scottish actor George Hamilton Sim (1852–1929), British soldier who played football for the Royal Engineers A.F.C. Chea Sim (1932–2015), Chinese-Cambodian politician Dave Sim (born 1956), Canadian comic book author Gordon Sim, set decorator Jon Sim (born 1977), Canadian ice hockey player Sheila Sim (1922–2016), English actress Thomas Robertson Sim (1858–1938), South African botanist Sir William Alexander Sim (1858–1928), New Zealand judge