William II, Count of Besalú

William II (assassinated 1066), called Trunus or el Tro, was the Count of Besalú from 1052.

He was the son and successor of William I and Adelaide. He married Stephanie, daughter of Geoffrey I of Provence. He had a son Bernard III and a daughter, Stephanie, who married Roger II of Foix.

His reign was characterised by conflict with the church. He had to cede Bàscara to the bishopric of Girona. He associated his brother Bernard II, later his successor, with him as co-count.