Justinus (Latin: Justinus or Iustinus) may refer to: People known by the name alone Justinus van Nassau (1559–1631), son of William of Orange ("the Silent") Justin Martyr (also "Iustinus", 100–165), Christian martyr Justin (historian) (Marcus Junianius (or Junianus) Justinus), a Latin historian who lived under the Roman Empire People with the given name Justinus Kerner (1786–1862), German poet Justinus Darmojuwono (1914–1994), Indonesian cardinal Justinus van der Brugghen (1804–1863), Dutch politician Sebald Justinus Brugmans (1763–1819), Dutch botanist See also Justin (disambiguation)