Bisexual people, or those who identify as having sexual and romantic attractions to more than one sex or gender, have emerged as a sexual minority group with unique mental health concerns and inequities. This chapter provides an overview of the extant literature related to a host of mental health disorders, highlighting findings among bisexual women and men in comparison to both lesbian/gay and heterosexual counterparts. The authors briefly note potential methodological issues that have not been previously discussed. The chapter then turns to relevant explanatory frameworks, and how these may be used to inform an understanding of mental health inequities among bisexual groups. Finally, suggestions are offered for areas of future research.