This current study reports the findings of sociolinguistic research investigating the place of the "voseo" in the Spanish language curriculum in the United States. The study describes the results of questionnaire responses from 177 US Spanish teachers and survey responses from 560 US college students of Spanish. Both instruments sought to identify the presence or absence of vos, the second person singular pronoun, in Spanish language textbooks and instruction and the respondents' understanding of the voseo vis-à-vis grammatically and culturally appropriate usage. The results indicate that the voseo is simply not included in texts, not taught by the teachers, and not learned by the students. Given that up to two-thirds of the Latin American population are denoted as voseo users, the profession should address this gap in Spanish language instruction. The article concludes with recommendations for curriculum, instruction, and professional development to facilitate the inclusion of the voseo in the Spanish curriculum in the United States.