Ortwin (also Ortuin, latinized Ortuinus) is a German given name, from ort "point" and win "friend".
It has been conflated with the name Hartwin (also Hardwin, Arduinus, Arduino), from hart "hard, brave" and win "friend", especially in the case of Hardwin von Grätz (1475–1542), better known in English as Ortwin, a German humanist scholar and theologian.