Over the last thirty years, organizational citizenship behavior (OCB) has been considered as one of the important concepts about organizational behavior. Today, many researchers in various countries are conducting empirical research into OCB. This paper reviews empirical research into OCB between 2010 and 2015, drawing on two academic research databases, and identifies the latest trends in the research. The paper lists more than one hundred OCB studies, and classifies them into those that investigate the individual, interpersonal/group, or organizational antecedents of OCB. The characteristics of OCB are documented for each category. The paper presents several findings from the research review as a guide to useful future OCB research.