thumb|Quaestiones, 14th-century manuscript. Città del Vaticano, Biblioteca Apostolica Vaticana, Fondo Vaticano latino, Vat. lat. 2301, ff. 13r-v, 20v.
Jacobus Balduinus (about 1175 – 10 April 1235) was an Italian jurist.
Balduinus was born in Bologna probably about 1175,