Kaki Mon'in (嘉喜門院, died 1380s?) was a Japanese noblewoman, Buddhist nun and waka poet of the Nanboku-chō period. She may have been the daughter of Ano Sanetame. She was a concubine of Japan's 97th emperor, Emperor Go-Murakami, an emperor of the Southern Court, and the mother of the 99th, Emperor Go-Kameyama, and possibly the 98th, Emperor Chōkei. Her birth name may have been Ano Katsuko or Ano Shōshi (阿野勝子), but the sources for this name date from the seventeenth century and later.
Seventeen of her poems were included in the Shin'yō Wakashū, an imperially commissioned waka anthology associated with the Southern Court, into which she was married. Her poetry commemorating the death of her late husband is particularly well-regarded.