Although psychologists have recently expressed interest in working for and with labor unions and their members, the relationship in the past has ranged from mutual indifference to open hostility. This traditional lack of interaction has created an information vacuum. Unions need to know that psychologists are not all alike, although they do all share a common goal of understanding, predicting, and assisting change in human behaviors. Four groups of psychologists offer services potentially useful to unions and their members. Clinical and/or health psychologists work with clients to understand and possibly change normal as well as abnormal behaviors. They use their understanding of human behavior to listen to and advise clients, and should be considered as potential providers of services to troubled employees and their families in such matters as substance abuse, job stress, family problems, absenteeism, or disturbances accompanying mental illness. Industrial/organization psychologist consultants can serve as consultants for quality of work life efforts, and can assist unions on internal organizational matters. Two other groups of psychologists, educators and researchers, are prepared to deliver high quality training and education programs for union staff as well as the rank and file members. Dialogue between unions and psychologists will take time, but with initiative on both sides, an exchange of mutually interesting and beneficial ideas is possible. (JAC)