Studies reporting the objective settlements obtained by men and women in negotiations were reviewed. Differences in outcomes were expected due to differences in perceptions, behaviors, and contextual factors between men and women. In the sample of studies, men negotiated significantly better outcomes than women. Opponent sex, relative power of the negotiator, integrative potential of the task, mode of communication and year of the study were tested as moderators of the effect. Although the overall difference in outcomes between men and women was small, none of these hypothesized moderators or several exploratory moderators reversed or eliminated this effect. The organizational significance of the findings is discussed in terms of the glass ceiling, a gender-based earnings differential and women in negotiation positions. Directions for future research in the laboratory and the field are suggested.