British Library
British Library: Discovering Literature: Medieval Drama and Mystery Plays
The mystery plays and morality plays of the 15th and 16th centuries were very different from modern drama. This article takes us back in time to show how these plays portrayed scenes from the Bible, conveyed religious doctrine, and...
New Advent
Catholic Encyclopedia: Miracle Plays and Mysteries
This site from The New Advent provides an excellent explanation of both mystery plays and miracle plays; five paragraphs are devoted solely to mystery plays, including definition, differences between 15th Century standards and modern...
University of Victoria (Canada)
University of Victoria: Moralities and Mysteries
This site from the University of Victoria, which is part of a much larger site on Shakespeare, describes morality plays. It also provides examples and links to complete texts of some medieval morality plays.