Oeyo; Go; or Satoko (1573 - September 15; 1626) was a prominently-placed female figure in the late Sengoku period. She married three times and her third and last husband Tokugawa Hidetada become the second Tokugawa shogun. She was also the mother of his successor Iemitsu; the third shogun. Oeyo; also known as Ogo; was the third and youngest daughter of the Sengoku period daimyo Azai Nagamasa. Her mother; Oichi was the younger sister of Oda Nobunaga.

Toyotomi Hideyoshi became the adoptive father and protector of Oeyo in the period before her marriage. Oeyo's oldest sister; styled Yodo-dono; Cha-Chaby birth name; was a prominent concubine of Hideyoshi and gave birth to his heir; Toyotomi Hideyori. Oeyo's middle sister; Ohatsu was the wife of Kyogoku Takatsugu and the mother of Kyogoku Tadataka. After Hidetada resigned the government to his eldest son in 1623; Oeyo took a Buddhist name; Sugen'in or Sogenin. Her mausoleum can be found at Zojo-ji in the Shiba neighborhood of Tokyo.