How does the theatrical world interact with spirits? How do spirits gain agency through performance? How have modern-day theatrical conventions been dictated by multi-generational attitudes towards spirits? This brief study examines close relationship between theatre and spirits, a relationship manifested through ritual and religious practice, tracing the the changing attitudes towards spirits through theatre history. Touching on international ideas such as Japan's noh , Korea's gut , Malaysia's mah yong , and Greek Drama, Theatre and Spirits combines theatre studies with ritual, religion, and performance studies, concisely explaining the complex relationship between theatre and the spirit world it may evoke: through the lens of theatre, everyday ritual and religious practice can also be understood at the level of theatricality.