Data for nationally representative samples of cohabiting couples in six developing countries show that intimate partner violence (IPV) increases the risk of self-reported sexually transmitted infections (STIs) for currently married women (ORs = 1.4-2.2) in all six countries, and that the strength of this relationship is not diminished by controls for proximate determinants such as husband's self-reported STI status and men's and women's higher-risk behaviors. The robustness of the IPV-STI relationship suggests the need to acknowledge IPV as an STI risk factor for women on par with other recognized risk factors such as multiple sexual partners and unprotected sexual intercourse.