Attitudes toward same-sex intimate relationships and toward intimate partner violence (IPV) are changing. Little research, however, has examined norms about IPV in same-sex relationships. Using a fractional factorial (experimental vignette) design, we conducted random-digit-dialed interviews in four languages with 3,679 community-residing adults. Multivariate analyses of responses to 14,734 vignettes suggest that IPV against gay male, lesbian, and heterosexual women is more likely than that against heterosexual men to be considered illegal, that it should be illegal, police called, and a stay-away order issued. Regardless of gender and sexual orientation, the type of abuse and whether a weapon was displayed are the strongest predictors of respondents' judgments about whether a behavior is illegal and merits a range of societal interventions.