Lilius is an old Finnish family who first appeared in records in the 16th century. The earliest documented members were the Sheriff Hans Rainenius (b. 1540), who lived in Satakunta, and his son Vicar Henrik Rainenius-Lilius (1590–1657). Notable Finns with this surname include:
Henrik Lilius (1683–1745), Finnish poet fi:Henrik LiliusJohan Lilius (1724–1803), Justice of the Hovrätt and founding member, with Henrik Gabriel Porthan, of the Aurora SocietyFrans Hugo Lilius (1860–1936), Finnish senator, Minister of JusticeFrans Oskar Lilius (1871–1928), Finnish senatorAlbert Lilius (1873–1947), Finnish professor of psychology at Helsinki University, pioneer in Developmental PsychologyAleko Lilius (1890–1977), Finnish adventurer and authorCarl-Gustaf Lilius (1928–1998), Finnish painter, sculptor and authorIrmelin Sandman Lilius (1936–), Finnish-Swedish author, married to Carl-Gustaf LiliusHenrik Lilius, (1939-) professor of art history at Helsinki University, professor of architectural history at Helsinki University of Technology and former head of The National Board of AntiquitiesMikael Lilius (1949-), former President and CEO of the Finnish energy company Fortum [1]