Anthusa of Constantinople commonly known as Saint Anthusa of Constantinople and in Orthodox usage as Saint Anthousa the Younger is a saint venerated in the Eastern Orthodox Church and the Catholic Church. Anthusa's feast days in the Orthodox Church are 12 and 18 April, while her feast in the Catholic Church is 18 April. In the Catholic Church, Anthusa is patroness of convents and abbeys. She was the daughter of Byzantine Emperor Constantine V.