International research collaboration is on the rise—and at the same time, women face potential barriers. Based on responses to surveys conducted among groups of women engineers, this article addresses (1) women’s frequency of international research collaboration; (2) the barriers to collaboration reported for both self and for other women; and (3) the patterns among women students as well as professionals, by national regions. Findings of this study have implications for policies to broaden participation in the increasingly important arena of international research collaboration, based on women in engineering, the scientific field in which women are most underrepresented. This makes the case focal for the study of women, science, and policy.