Alexander (died after 1142) was the second count of Conversano (1085–1132), the son and successor of Geoffrey the Elder.
Alexander, with his brother Tancred, was a constant thorn in the side of Roger II of Sicily. He took part in a civil war that broke out in Bari. Risone, the archbishop of the city, was murdered (1117) and the princess of Taranto, Constance of France, was imprisoned at Giovinazzo (1119) by Grimoald Alferanites, the prince of Bari, and Alexander.
After Roger was defeated at the Battle of Nocera in 1132, Tancred returned to the Mezzogiorno and entered into open rebellion again, taking the cities of Montepeloso and Acerenza, with the support of their populations. He raised a force with his brother Alexander, Count Godfrey of Andria, Count Ranulf of Alife, and Prince Robert II of Capua. Roger crossed the Straits of Messina with a large force and Alexander was so afraid that he abandoned his city of Matera to his son, Geoffrey the Younger, and fled to the court of Ranulf. After Roger's successfully besieged Matera, Alexander, deeply grieved, fled to Dalmatia. He was deprived of his fief and unable to return home. He tried to meet up with the Emperor Lothair II, but was