This article explores how political communication institutions affect cross-national differences in voter turnout in democratic elections. It demonstrates how the structure and means of conveying political messages—gauged by media systems, access to paid political television advertising, and campaign finance laws—explain variations in turnout across 74 countries. Relying on a “mobilization” perspective, I argue that institutional settings that reduce information costs for voters will increase turnout. The major empirical findings are twofold. First, campaign finance systems that allow more money (and electioneering communication) to enter election campaigns are associated with higher levels of voter turnout. Second, broadcasting systems and access to paid political television advertising explain cross-national variation in turnout, but their effects are more complex than initially expected. While public broadcasting clearly promotes higher levels of turnout, it also modifies the effect of paid advertising access on turnout.