This study was designed to determine the effects of play therapy on the adjustment of children identified as socially and psychologically maladjusted. The effects of play therapy on six variables were investigated. Those variables were: social adjustment, personal adjustment, self-concept, school-related self-concept, behavioral maturity as rated by the teacher, and inferred self-concept as rated by the parent. The general nature of the research hypotheses was that play therapy would effect positive change in the children on the six variables. The results of the study led to the conclusion that during a fifteen-week period play therapy effects statistically significant change in social adjustment, but not in personal adjustment, self-concept, or behavior as perceived by others. Implications of the study based on observations of the experimenter were that all changes made during the therapy process were not reflected by the tests which were available. It was recommended that further research on the effects of play therapy place special emphasis on the selection or development of instruments to measure changes made during therapy.