John Laskaris or Lascaris may refer to: John IV Laskaris (1250–c.1305), emperor of Nicaea John Laskaris Kalopheros (1325/30–1392), Byzantine aristocrat John Laskaris (composer) (fl. early 15th century), Greek composer in Venetian Crete Janus Lascaris (c.1445–1535), Greek scholar Giovanni Paolo Lascaris (1560–1657), Grand Master of the Knights of Malta