Rikei (理慶, 1530 – September 23, 1611) was a Japanese noble lady, calligrapher, poet and scholar. She was the eldest daughter of Katsunuma Nobutomo (勝沼 信友), a Takeda samurai and retainer of the Sengoku period with Takeda lineage. She lived as a Buddhist nun at Daizen-ji temple at Mount Kashiwao and is most notable for her military history, Rikei-ni no Ki, or "Nun Rikei’s Account."