Casady's theatre program begins in Middle Division, with drama offered as an elective to students in 7th and 8th grade. There is also an annual performance in Middle Division, with recent examples being School House Rock Jr. and Moana Jr.

In Upper Division, the theatre program expands to include acting and technical theater which includes considerations like lighting, set design and audio systems. An independent study in theater is also available. Upper Division also includes two annual performances: one music and one play, with recent examples including Peter and the StarCatcher, 12 Angry Jurors, Mamma Mia, and Twelfth Night.
Casady School is an independent, co-educational, college preparatory, Episcopal day school serving students in pre-k-12. Educating Mind, Body, and Spirit.
Casady School is a PreK-12, independent, college preparatory Episcopal day school committed to deeper-level learning. Casady School welcomes a student body that reflects the diversity of the world around us and therefore does not discriminate on the basis of race, color, religion, gender identity, sexual orientation, socioeconomic status, nationality, or ethnic origin in administration of its educational policies, admissions policies, scholarship and loan programs, athletics, and other school-administered programs generally accorded or made available to students at the School.