- Titles: Gagaku no kami
- Japanese: 酒井 忠顕 (Sakai Tadateru)
Sakai Tadateru was a late Edo period head of the Sakai clan and lord of Himeji han.
Born a son of Miyake Yasunao, lord of Tahara han, he was adopted into the Sakai clan by Sakai Tadatomi. Upon Tadatomi's death in 1853, Tadateru succeeded him as lord of Himeji and head of the house.
- Ishin Shiryô Kôyô 維新史料綱要, vol 1 (1937), 496.