The conventional wisdom is that voice leads to desirable outcomes for organizations. However, this is most certainly an oversimplification. Of the over 1,000 studies examining the impact of voice in organizations, the implications of voice vary by the level of the organization (individual, group, organization) as well as the outcome of interest (e.g., group harmony vs. job satisfaction). In this article, we draw from the diverse literatures examining the impact of voice to integrate the theoretical frameworks and empirical results for voice outcomes across organizational levels. To do so, we start with a discussion of the definition and development of voice as a construct, beginning with Hirschman's seminal work on voice/exit/loyalty. We then review the theoretical frameworks within each level that explain the effect of voice on outcomes, highlight the role of mediating or moderating mechanisms, and discuss directions for future research. Finally, we emphasize emerging trends in the study of voice and suggest areas in which the various literatures may benefit from borrowing across fields and levels of interest to produce a more comprehensive, theoretically grounded, and cohesive body of work.