Lady Otsuya

Otsuya no Kata
おつやの方
Castellan of Iwamura castle
(De facto Toyama clan head)
Assumed office
1572
Preceded byTōyama Kagetō
Personal details
DiedDecember 1575
Spouse(s)Tōyama Kagetō
Akiyama Nobutomo
RelativesOda Nobunaga (nephew)
Oichi (niece)
Military service
Allegiance Oda clan
Takeda clan
Unit Toyama clan
Battles/warsSiege of Iwamura castle

Lady Otsuya (おつやの方 Otsuya no Kata) was a Japanese female samurai (onna-musha) from the Sengoku period. She was the ruler of Iwamura Castle until the last days of her life.

According to legend, Otsuya is best known for the aunt of the famous samurai Oda Nobunaga, the wife of Tōyama Kagetō and foster mother of Oda Katsunaga. She also having conspired against the Oda clan and fought against her nephew, Oda Nobunaga. Her execution under Nobunaga may have been one of the reasons for the decline in Nobunaga's reputation, who would later be murdered by Akechi Mitsuhide and other traitors in the Incident of Honnoji.