Ohatsu (お初) or Ohatsu-no-kata (お初の方) was a prominently placed figure in the late Sengoku period. She was daughter of Oichi and Nagamasa Azai, and the sister of Yodo-dono and Oeyo. Alongside her sisters, she was active in the political intrigues of her day. Ohatsu's close family ties to both the Toyotomi clan and the Tokugawa clan uniquely positioned her to serve as a conduit between the rivals. She acted as a liaison until 1615 in the siege of Osaka, when the Tokugawa eliminated the Toyotomi.

Oichi was a female historical figure in the late Sengoku period. She is known primarily as the mother of three daughters who became prominent figures in their own right – Yodo-dono, Ohatsu and Oeyo. Oichi was the younger sister of Oda Nobunaga; and she was the sister-in-law of Nōhime, the daughter of Saitō Dōsan. She was descended from the Taira and Fujiwara clans.