The primary goal of this project is to provide a summary of extant research regarding humor in the classroom, with an emphasis on identifying and explaining inconsistencies in research findings and offering new directions for future studies in this area. First, the definitions, functions, and main theories of humor are reviewed. Next, the paper explains types of humorous instructional communication. Third, the empirical findings of both the source and receiver perspectives are reviewed. Finally, this paper concludes with advice for educators and suggests potential future research directions for scholars. (Contains 2 notes and 1 table.)