This paper examines party system polarization over 19 general elections in Turkey from1950 to 2018. Using data on party policies from the Comparative Manifesto Project (CMP), we show that, contrary to the common view, party system polarization is not a persistent feature of Turkish politics. We also find that party system polarization on the left-right continuum reflects party differences primarily on social rather than economic or European integration issues. Finally, our results demonstrate that the military interventions in 1960 and 1980 reduced party system polarization in subsequent elections, even when controlling for other determinants of polarization. These findings have important implications for debates on party politics, military rule, and the prospects of democratic governance in developing democracies.