Bessho Nagaharu (別所 長治, 1558 – February 2, 1580) was a Japanese daimyō of the Sengoku period. He was the eldest son of . In 1578 Oda Nobunaga called on his retainers to attack the Mōri clan. Nagaharu almost decided to allied with the Oda clan, but after hearing that the low-born general Hashiba Hideyoshi whom he did not respect as the leader, he was revolted, instead allying himself with Hatano Hideharu of Tanba province.