Justinus may refer to:
Justinus van der Brugghen (1804–1863), Dutch politician Justinus Darmojuwono (1914–1994), Indonesian cardinal Justinus Kerner (1786–1862), German poet Justinus van Nassau (1559–1631), Dutch army commander, only illegitimate son of William of Orange Oskar Justinus (1839–1893), German dramatist
See also Justin (historian) (Marcus Junianius Junianus Justinus), 2nd century Latin historian who lived under the Roman Empire Justin Martyr (also "Iustinus", 100–165), Christian martyr Justin (disambiguation)