Use of a mediator to facilitate voluntary agreements between disputants is becoming a widely used method of conflict resolution in a variety of contexts. This study simulated a dispute to examine the influence of mediator and negotiator gender on mediator behavior. Male (N=94) and female (N=94) college students mediated a computer-simulated dispute between either two males, two females, or a male/female pair. The results revealed a gender difference in the type of messages the mediators sent to those designated as bargainers. Compared to females, males were more confident in their ability to mediate and felt that their recommendations had greater influence on negotiators. It was more important to females that the negotiators approve of their recommendations. Males used coercive pressing and compensating tactics more than did females; females used integrating tactics and were more inactive than were males. Mediators were more likely to use coercive pressing and compensating tactics with opposite gender negotiation pairs than with same gender pairs. No gender related effects were found for the quality of mediators' proposals. (Author/NB)