There is limited research on risk and protective factors for cyber intimate partner violence (IPV), such as normative beliefs supporting cyber IPV. The purpose of this study was to develop a measure of normative beliefs supporting cyber IPV and to evaluate its psychometric properties. The initial item pool was developed from information gathered from focus groups, a thematic analysis of existing measures, and an expert review. The item pool was then administered to a sample of 259 emerging adults (Mage = 22 years;SD= 2.19, range = 18–25; 51% female) recruited via a Qualtrics panel. Based on an exploratory factor analysis, Horn’s Parallel Analysis, and goodness-of-fit indices, a single-factor structure was identified. Items related to monitoring cyber activity following a partner’s infidelity did not load well onto the model. A confirmatory factor analysis found strong support for a one-factor model. The Beliefs Supporting Cyber IPV scale was positively correlated with cyber IPV perpetration, in-person IPV perpetration, and beliefs supporting in-person IPV. Findings suggest that beliefs supporting cyber IPV is a distinct construct that can concurrently predict cyber IPV behaviors.