Divorce can be detrimental to the psychological (Amato [2000],Journal of Marriage and Family,62(4), 1269–1287; [2010],Journal of Marriage and Family,72(3), 650–666) and physical health of many but not all (Sbarra & Coan [2017],Current Opinion in Psychology,13, 91–95). This review of 21 longitudinal studies is divided into two parts: individuals followed postdivorce/separation where there was no intimate partner violence (IPV) and where there was IPV. Given the past reviews of individuals followed postdivorce where IPV was not reported, this review focuses on individuals where there was IPV but also provides an update on the former results. Measures evaluating the impact of divorce or separation were dependent upon measures in the longitudinal studies, including evaluations of well-being, depression, and anxiety. When there was no IPV, variability in postdivorce well-being differed according to prior marital quality, with individuals in low-quality marriages experiencing relief postseparation/divorce. Lower income levels were associated with poorer well-being following divorce. For physically abused women, separation is often associated with continued abuse, but on average, the well-being of abused women increases across time, as abuse often declines. However, the worse the abuse prior to separation, the more likely the abuse continues, and in extreme cases, separation results in the homicide of abused individuals. Since IPV and intimate partner homicide are perpetrated disproportionately by Black men, there is a clear need for longitudinal research on intimate relationships with populations of color. A model predicting the mental health of individuals in preseparation IPV relationships is presented, which includes internalizing characteristics of the victim, preseparation abuse, contact with ex-partner, support variables, and beliefs in accord with separation being the right thing.