The purpose of this study was to examine how classroom conversations about diverse dialects of English can provide a useful foundation for critical language and literacy instruction for students who speak African American Vernacular English (AAVE) and other stigmatized dialects. This article describes a weeklong unit on language variety that implemented what we call "critical language pedagogy" in three predominantly African American, 10th-grade English classes. Analyses of class discussions, interviews, and pre- and post-questionnaires demonstrate that the unit helped students critique dominant language ideologies, become more conscious of their own code-switching, and view dialect variation as natural and desirable.