Landulf or Landulph, Italian Landolfo and Latin Landolfus, Landulphus, etc., is a masculine given name of Germanic (possibly Lombardic) origin. It may refer to:

• Landulf I of Benevento
• Landulf II of Benevento
• Landulf III of Benevento
• Landulf IV of Benevento
• Landulf V of Benevento
• Landulf VI of Benevento
• Landulf I of Capua
• Landulf II of Capua
• Landulf III of Capua
• Landulf IV of Capua
• Landulf V of Capua, see Landulf III of Benevento
• Landulf VI of Capua, see Landulf IV of Benevento
• Landulf VII of Capua
• Landulf VIII of Capua
• Landulf II (archbishop of Benevento)
• Landulf of Carcano
• Landulf of Conza
• Landulf of Gaeta
• Landulf of Milan
• Landulf of Yariglia
• Landulf Junior

• Landolfo Brancaccio (died 1312), Neapolitan aristocrat and Catholic cardinal
• Landolfo Caracciolo (died 1351), Neapolitan Franciscan theologian, diplomat and prelate
• Landolfo Maramaldo (1381–1415), a cardinal-deacon of San Nicola in Carcere, a titular church in Rome
• Landolfus Sagax or Landolfo Sagace, 11th century Langobard historian

• Landulph, a town in England
• Landulfids, a dynasty named after a Landulf
• Landolfi, an Italian surname
• Pompeo Landulfo (after 1567–1627), Italian painter