To understand Latin American politics, one must view it through the eyes and minds of Latin Americans. Since the middle of the 20th century, pollsters in academia, government, and industry have fielded public opinion surveys in an attempt to do just that. Although they are not typically considered political institutions, polls and surveys influence a variety of political processes directly and indirectly thanks to the legitimacy they enjoy among academics, policymakers, and publics. Large strides have been made toward making surveys more methodologically rigorous and toward improving the quality of survey data in the region. Scholars have leveraged the data to advance the theoretical understanding of a range of topics, especially political support, partisanship, and voting behavior. Despite these gains, public opinion surveys face clear challenges that threaten their hard-won legitimacy. To the extent that these challenges are met in the coming decades, public opinion polling’s role in shaping Latin American politics will remain, if not strengthen.