Many are unfamiliar with the field of industrial-organizational (I-O) psychology. Vocational interests are often used to guide students' academic and career choices, but there is no scale that measures interest in the specific areas of I-O psychology. Study 1 and 2 present the initial development and refinement of the I-O Psychology Interest Inventory (IOPII) based on reliability analysis. Study 3 used IOPII scores to match students in a peer mentoring program and found that students who were matched using the IOPII were more satisfied with their mentor than students who were randomly matched. We encourage further validation of the IOPII.