The Keepers is a seven-episode American documentary series that explores the unsolved murder of nun Catherine Cesnik in 1969. Cesnik taught English and drama at Baltimore's all-girls Archbishop Keough High School, and her former students believe that there was a cover-up by authorities after she suspected that a priest at the high school, A. Joseph Maskell, was guilty of sexually abusing students. The series was directed by Ryan White and released on Netflix in 2017.

Catherine Anne Cesnik was a Roman Catholic religious sister and a teacher at Archbishop Keough High School in Baltimore, Maryland, United States. On November 7, 1969, Cesnik disappeared. Her body was discovered on January 3, 1970, near a garbage dump in the Baltimore suburb of Lansdowne. Her unsolved murder served as the basis for the Netflix documentary series The Keepers in 2017.