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Intimate partner violence is a serious and pervasive social problem with deleterious consequences for survivors' well-being. The current study involved interviewing 160 survivors 6 times over 2 years to examine the role of social support in explaining or buffering these negative psychological consequences. The authors examined both between- and within-persons variability to explore women's trajectories regarding their experiences of abuse, social support, depression, and quality of life (QOL). Findings revealed the complex role of social support on women's well-being. Evidence was found for main, mediating, and moderating effects of social support on women's well-being. First, social support was positively related to QOL and negatively related to depression. Social support also partially explained the effect of baseline level and subsequent change in physical abuse on QOL and depression over time, partially mediated the effects of change in psychological abuse, and moderated the impact of abuse on QOL. The buffering effects of social support were strongest at lower levels of abuse. Implications for future research and intervention are discussed.