Customer loyalty programs have been widely adopted for customer relationship management all over the world. The proliferation of loyalty programs causes program competition which weakens the effectiveness of loyalty programs at the end of customers. In general, existed research suggests that the increasing competition among rival programs in a single industry may cancel out the expected roles of loyalty programs (Mägi, 2003). For example, program competition is a substantial threat to customer lifetime value and share of wallet (Leenheer, van Heerde, Bijmolt, & Smidts, 2007; Meyer-Waarden, 2007). Liu and Yang (2009) find the sales impact of a single loyalty program diminishes as program competition increases. Their study also shows this negative effect is weaker in a highly expandable product category. Although previous studies have examined the suppressive effect of program competition on financial outcomes of loyalty programs, little research has explored its role on attitudinal customer loyalty formation process. This study aims to explore the differential roles of program competition on two formation processes of customer loyalty. It intends to contribute to the loyalty programs literature in two aspects. First, this study examines two routines of customer loyalty formation in the context of loyalty programs. That is, a company can leverage program offerings to build customer loyalty through increased customer satisfaction or strengthened customer identification with the company. Second, this study examines the moderating roles of program competition on those two loyalty-generating routines. Specifically, it finds customer identification is more important for building customer loyalty at the presence of program loyalty.