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Background and Aims: Numerous studies have demonstrated that alcohol preceded and increased the odds of intimate partner violence (IPV). These prior studies were restricted to one dyad member despite theory suggesting that acute alcohol use by both partners should increase the risk for IPV to a greater degree than when only one partner drinks. We hypothesized that alcohol use by both dyad members, relative to one or no dyad members, would proximally precede and increase the odds of IPV perpetration and victimization. Design: A 60‐day daily diary design was used, where both dyad members of dating couples completed independent reports on IPV perpetration/victimization and alcohol use via a secure survey website. Setting and Participants: Alcohol using college‐student couples, aged 18–25 (n = 181 couples), from a Midwestern university in the United States participated. A convenience sample strategy was used. Measurements Daily surveys asked about alcohol use and IPV perpetration and victimization the prior day, including whether alcohol use preceded or followed IPV. The primary outcome was psychological IPV; secondary outcomes were physical and sexual IPV. Findings Longitudinal random effects models suggested statistically significant associations between drinking behavior and IPV outcomes. The odds of psychological IPV perpetration were higher when both partners were drinking relative to one partner drinking [adjusted odds ratio (aOR) = 1.13, 95% confidence interval (CI) = 1.06–1.99]. Exploratory analyses showed some indication that the odds of physical IPV victimization were higher when both partners were drinking relative to one partner drinking (aOR = 2.09, 95% CI = 1.71–4.21). Conclusions: The risk for intimate partner violence appears to be greater when both partners drink, relative to one partner or neither partner. [ABSTRACT FROM AUTHOR]