While mood has been found to affect brand extension evaluations, the specific mechanisms by which it affects those evaluations remain largely untested. This study suggests that mood-induced differences in cognitive processing style (relational vs. item-specific elaboration) are possible explanations affecting brand extension evaluations. Results of two experiments showed that consumers in a positive (vs. negative) mood engaged in relational (vs. item-specific) elaboration and consequently evaluated brand extensions and brand extension fit more favorably than consumers in a negative mood. The effects were found immediately after exposure (Experiment 1) and after a one-week delay (Experiment 2). Theoretical and practical implications are discussed. © 2011 Wiley Periodicals, Inc.