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This paper explores the relationships of various employees' identifications (personal, interpersonal, micro-group, group and organizational) in their two components (cognitive and affective) with two dimensions of organizational citizenship behavior (OCB): offering quality ideas and suggestions, and providing help and support within small work groups. Two studies were conducted in Russia on two respective samples: (1) employees of commercial enterprises (N = 183) characterized by a relatively high regularity and intensity of within-group interactions; and (2) the academic staff of higher education institutions (N = 157), which typically have relatively less regular, low-intensity within-group interactions. The research employed four questionnaires to assess the participants' identifications in both of their components. In addition, managers in the respective organizations filled out an organizational communicativeness questionnaire and a two-factor OCB assessment instrument. It was found that the relationships between (a) particular identifications and (b) the ratio of group identification to other identifications, on the one hand, and OCB, on the other, depend on the degree of regularity of within-group interactions, as well as on the identification components. Organizational communicativeness did not moderate the relationship between identifications and OCB, but was significantly positively correlated with both OCB dimensions. The theoretical and practical implications of the study findings are discussed.