Hillen is a surname. Notable people with the surname include:
Elsemiek Hillen (born 1959), Dutch field hockey player Fritjof Hillén (1893–1977), Swedish footballer Hans Hillen (born 1947), Dutch politician Jack Hillen (born 1986), American ice hockey player John Hillen (born 1966), American businessman Michiel Hillen van Hoochstraten (c. 1476–1558), Flemish printer and publisher Seán Hillen (born 1961), Irish artist Solomon Hillen Jr. (1810–1873), American politician