There has been an increasing trend of using code-switching to enhance ad persuasion among local and global brands. Ads that include two or more languages are referred to as code-switched ads (Luna and Peracchio 2005a; 2005b). It is noted that previous studies investigating code-switched ad effectiveness have focused on bilinguals, not monolinguals. Due to the emerging use of code-switching in ads in monolingual markets, more research efforts are required to understand its effectiveness and boundaries among the monolinguals. The purpose of this study is to investigate the moderating role of consumer local-global identity in the effectiveness of code-switched ads among monolinguals. Two experiments were conducted and the results confirmed our hypothesis that consumer local-global identity moderates the effect of code-switched ads. The results indicated that congruence between consumer local-global identity and code-switching enhanced persuasiveness. In addition, the mediating effect of ad involvement was identified. These findings provide managerial implications for marketers.