Julin is a Nordic surname. Notable people with the surname include:
Åke Julin (1919–2008), Swedish water polo player Albert von Julin (1846–1906), Finnish businessman and vuorineuvos Albert Lindsay von Julin (1871–1944), Finnish engineer, businessman and vuorineuvos, nephew of Albert Cecilia Julin (born 1955), Swedish diplomat Erik Julin (1796–1874), Finnish apothecary, shipowner and industrialist, uncle of Albert (1906–1990), Swedish botanist Harald Julin (1890–1967), Swedish swimmer and water polo player, father of Åke and Rolf Helene von Julin (1842–1881), Finnish noblewoman, daughter of John von Julin and mother of Carl Gustaf Emil Mannerheim Jessica Julin (born 1978), Finnish football player John von Julin (1787–1853), Finnish pharmacist, factory owner and vuorineuvos, father of Albert and brother of Erik Magda Julin (1894–1990), Swedish figure skater Pia Julin (born 1969), Finnish Olympic shooter Rolf Julin (1918–1997), Swedish water polo player, son of Harald and brother of Åke Urho Julin (1928–2002), Finnish Olympic runner