Gregoriussen is a surname. Notable people with the surname include:
Liffa Gregoriussen (1904–1992), Faroese fashion designer and feminist Jákup Pauli Gregoriussen (1932–2021), Faroese architect J.P. Gregoriussen (1845–1901), Faroese poet and writer
See also Nils Gregoriussen Skilbred (1860–1943), Norwegian politician