- Birth: 1564
- Death: 1619
- Title: Saemon no jô
- Distinction: Tokugawa retainer
- Japanese: 酒井 家次 (Sakai Ietsugu)
Ietsugu was the son of Sakai Tadatsugu and held Yoshida from 1578 until 1590, at which point he received a 30,000-koku fief in Kôzuke province (Usui). He saw his income raised to 50,000 in 1594. He fought at Sekigahara and the Osaka Castle campaigns and in 1619 received a 100,000-koku fief at Takata in Echigo province.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005