The tour leader plays a critical role in travel decisions. Recently, the attachment theory has been extended into the domain of travel behavior. However, little academic attention has been paid to the attachment of tour leader. The purpose of this study was to examine the effect of tour leader attachment on customer citizenship behaviors (CCBs). Furthermore, the study investigated the extent to which customer commitment mediates the relationship between tour leader attachment and CCBs. Online survey data from 459 tourists indicate that tour leader attachment is positively related to CCBs. Furthermore, customer commitment mediates the relationship between tour leader attachment and CCBs. Implications of these findings as well as future research are subsequently discussed.