The role of word-of-mouth in relationship marketing (RM) has been treated solely as an outcome of relationship activities. This author argues that contemporary research may not fully capture the essential roles of WOM in RM and that WOM is both an antecedent of RM, as well as its outcome. After a comprehensive review of extant literature, the author conducts a multigroup survey, which establishes a significant, positive relationship between WOM valence and two key mediators of RM: trust and commitment (Morgan and Hunt 1994). This study also finds that conflict control and perceived consumer benefits are partial mediators and the level of consumer loyalty is a moderator of those two relationships. As a result, the author calls on marketers to give more attention to proactive WOM campaigns, which are critical for establishing long-term reciprocal relationships with consumers and ultimately for reaching firms’ strategic goals.