Justinian I (483–565), also known as the Great, was a Byzantine emperor.

Justinian may also refer to:

People Justinian II Rhinotmetus (669–711), Byzantine Emperor Justinian (magister militum per Orientem) (c. 525–582), Byzantine general, nephew of Justinian I Justinian of Ramsey Island, 6th-century Welsh hermit Sir Justinian Isham, 2nd Baronet (1610–1675), English scholar and politician Justinian Marina or Patriarch Justinian of Romania (1901–1977), Patriarch of the Romanian Orthodox Church from 1948 to 1977 Justinian Jessup (born 1998), American basketball player Justinian Rweyemamu (1942–1982), Tanzanian economist and mathematician Jusztinián György Serédi (1884–1945), Roman Catholic cardinal and Primate of Hungary Justinian Tamusuza (born 1951), Ugandan composer Lawrence Justinian (1381–1456), first Patriarch of Venice

Other uses Justinian (novel), a novel by Harry Turtledove Justinian (1787 ship), a storeship sent to the convict settlement at New South Wales in 1790 SS Justinian, a Norwegian cargo ship in service from 1946 to 1954

See also Justiniana Prima, a Byzantine city that existed from 535 to 615 Giustiniani, a Venetian family Giovanni Giustiniani (1418–1453), navy captain, from the Genoese branch of the family Iustinianus (magister militum in Gaul) (died 407), Roman general