St. Joan of Arc Secondary School (SJA, Chinese: 聖貞德中學) is a Roman Catholic co-educational school founded in 1955 by a group of Catholic women who graduated from the University of Hong Kong.

Chinese is the primary medium of instruction in St. Joan of Arc Secondary School.

All classes are named after a Christian virtue: Faith, Hope, Charity, Justice, Wisdom and Courage.

There are 31 air-conditioned classrooms and 15 special rooms fully equipped with IT facilities.

There are also a chapel, a playground, a school hall, a student-activity centre, a lecture hall, a multimedia learning centre, a library fully equipped with IT facilities, a newly designed music room and a visual art room in our school.