Shimazu Katsuhisa (島津勝久; 1503-1573) is the fourteenth head of Shimazu clan and the third son of Shimazu Tadamasa.
He contested against the fifth head of the Satsuma branch of Shimazu clan Shimazu Sanehisa for the head of the Shimazu clan but lost and was expelled to Bungo Province. He offered a proposal to welcome Shimazu Takahisa of Mimasaka branch of Shimazu clan as the head of the clan and succesfully ousted Sanehisa.
Katsuhisa tried to rule the clan, essentially as the adopted father of Takahisa, but was expelled by Takahisa himself for opposing his policies. According to the record kept by Shimazu clan, it is said that he travelled to and fro for rest of his life.
Shimazu (島津) was the family name of the daimyo of the Satsuma han, spreading through Satsuma, Osumi Hyuga provinces in Japan.
The founder, Shimazu Tadahisa (1179–1227), was a shugo daimyo during the Kamakura period, ruling Satsuma, Osumi, and Hyuga Provinces.
The 31st head of the Shimazu clan, Hisamitsu (1871–1887) was the daimyo of the Satsuma Han at the time of the Boshin War and the Meiji Restoration, in which Satsuma played a major role.
The Shimazu dispatched a force under Shimazu Iehisa to Shimabara and in 1584 they and the Arima, with a combined 3,000 men, defeated the much larger Ryûzôji army at Okitanawate, a battle in which Takanobu was killed.
Shimazu Yoshihisa was the eldest son of Shimazu Takahisa (1514-1571) and a lady of the Iriki-in family.
While the Shimazu worked to consolidate their hold over Southern Kyushu and hold on to their forts in Higo, the Ryûzôji were active on another front, forcing the smaller clans of the Shimabara area of Hizen to submit.