Emi Koyama (born 1975) is a Japanese-American activist, artist, and independent scholar. Koyama's work discusses issues of feminism, intersex human rights, domestic violence, and sex work among many others. Koyama is best known for her 2000 essay "The Transfeminist Manifesto", which has been republished in many anthologies and journals for transgender studies. She is a founder of the advocacy group Intersex Initiative.