After addressing the meaning of “trust” and “trustworthiness,” we review survey-based research on citizens’ judgments of trust in governments and politicians, and historical and comparative case study research on political trust and government trustworthiness. We first provide an overview of research in these two traditions, and then take up four topics in more detail: (a) political trust and political participation; (b) political trust, public opinion, and the vote; (c) political trust, trustworthy government, and citizen compliance; and (d ) political trust, social trust, and cooperation. We conclude with a discussion of fruitful directions for future research.