Robert of Lauro (died 1183) was the Count of Caserta, a powerful nobleman and administrator in the Kingdom of Sicily, "effectively the king's viceroy on the mainland" between 1171 and his death. He was a close colleague of Count Tancred of Lecce, the future king. His influence helped his cousin Roger become Archbishop of Benevento (1179–1225).
In 1168, when Count Bohemond II of Manoppello accused Count Richard of Molise of a conspiracy against the Chancellor Stephen du Perche, it was Robert who prevented the case from being settled by judicial duel when he alleged that Richard had also illegally acquired the town of Mandra and others near Troia from the crown. Robert was made the first master constable and master justiciar of the Duchy of Apulia and the Terra di Lavoro (in Latin, magister comestabulus et justitiarius Apuliae et Terra Laboris) in 1171, when a new system for governing the mainland territories of the kingdom was instituted following the restoration of royal authority in 1169 after years of unrest and open rebellion.
In 1171 Robert convened a curia (court) in Capua, outside his jurisdiction, with two royal justiciars, Matthew de Venabulo and John de Valle. In 1172 King William II ordered Robert and Count Richard of Gravina with the chamberlain (camerarius) of the Terra di Lavoro to determine whether the monastery of Sora had been gifted by William's predecessor, Roger II, with the rents of four churches. In 1173 he, two royal justiciars, and a chamberlain were in Capua to adjudicate a case relating to the abbey of Santa Sofia of Benevento. In 1176 Tancred of Lecce succeeded Richard of Gravina as constable and justiciar in the same district as Robert. While Tancred generally held court at Bari, Barletta and Troia, Robert was generally at Caserta, Capua or Aversa. The equal competence of either is illustrated by Robert's advice to the monks of Casauria that they could seek justice from either him or Tancred (1182).