We conceptualize generalized exchange orientation, and develop and validate a scale assessing individual orientations toward generalized exchange as well as reciprocal and negotiated exchange for offering a full set of measurements for social exchange orientation. Through 4 phases and using data from 1,408 participants, we established factorial, nomological, discriminant, and incremental validity of the social exchange orientation Scale and examined measurement invariance of the scale between samples from the United States and Japan. First, our findings indicate the newly developed scale for generalized exchange orientation (GEO) is distinct from measures of other forms of social exchange orientation and prosocial orientation. Second, the GEO Scale shows incremental validity as it predicts citizenship behaviors toward individuals above and beyond the key dispositional antecedents known in the literature. Implications and future research on generalized exchange are discussed. (PsycINFO Database Record (c) 2019 APA, all rights reserved).