Forn is a Spanish surname. Notable people with the surname include:
Ivar Andreas Forn (born 1983), Norwegian footballer Joaquim Forn (born 1964), Spanish Catalan politician Josep Maria Forn (born 1928), Spanish actor and filmmaker Juan Forn (1959–2021), Argentine writer and translator Teresa Forn (born 1959), Spanish Catalan runner
See also Cala Forn, a painting by Joaquim Sunyer El Forn, a hamlet in Andorra Forn Sed Norge, a Norwegian heathen religious organization