Despite Turkey's long-standing history of inter-party democracy, its political parties have remained distant from intra-party democracy (IPD). This study investigates the quality and level of Turkey's four big parties' IPD culture with a systematic, quantitative survey data collected from parties' district members in 2015. The data analysis demonstrates that despite its anti-systemic left-radicalism and alleged association with the armed groups, the Kurdish left (HDP) is relatively the most internally democratic party. The centre-left CHP has some edge owing to its limited use of primaries for candidate selection, yet it often comes secondary after the HDP. The two parties of the Turkish-Islamic right, AKP and MHP, are relatively more autoc...