- Died: 1553
- Sons: Shimazu Yoshitora, Shimazu Tadatoshi (Shikibu daisuke; 1508-1549)
- Distinction: Shimazu retainer
- Japanese: 島津実久 (Shimazu Sanehisa)
Shimazu Sanehisa of the Sasshû Shimazu clan, was responsible for a prominent succession dispute within the Shimazu clan in the 1520s.
Though born of illegitimate Shimazu clan descent, he eventually became lord of Izumi castle. In 1527, he joined with Shimazu Katsuhisa and attacked Kagoshima castle in order to drive Katsuhisa's adopted heir, Shimazu Takahisa, out. He gradually expanded his power, driving Niiro Tadakatsu, who opposed him, out of Shibushi, and going so far as to earn the title of "lord of three provinces" from his followers. Katsuhisa, however, meanwhile, escaped to Chôsa in Ôsumi province, and turned against Sanehisa.
Though Sanehisa managed to hold off the Sôshû Shimazu for some time, Takahisa and his father Shimazu Tadayoshi gradually expanded their territory; Sanehisa fought with the Iriki-in clan and in 1539 suffered a number of losses to the Sôshû at Kaseda, Ichiki, Kawanabe, and Murasakibaru, and was eventually driven out of Kagoshima. Takahisa was recognized as lord of the three provinces in 1545.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005
- "Shimazu Sanehisa," Satsuma Shimazu-ke no rekishi, Shôkoshûseikan official website.
- "Sanehisa-tô to no tatakai," Satsuma Shimazu-ke no rekishi, Shôkoshûseikan official website.
- This refers to the three provinces traditionally controlled by the Shimazu: Satsuma, Ôsumi, and Hyûga.