"Sister Mary Ignatius" is a one-act play written by Christopher Durang in 1979. The play centers around a strict and devout nun, Sister Mary Ignatius, who teaches a group of students about morality and faith. The narrative explores themes of religion, authority, and the complexities of human behavior through her interactions with former students. The character of Sister Mary Ignatius is portrayed as both humorous and harsh, reflecting the contradictions often found in religious figures. The play critiques the rigidity of dogma while also highlighting the struggles of individuals seeking understanding and acceptance within the confines of Catholicism.