Abstract Public accountability is an indication of modern and democratic Governance. If ‎governments are not responsive to their people in relation to their actions, ‎mistakes and decision making, democracy will be maxim. Therefore, public ‎accountability as an institution, is complementary to public administration in a ‎modern and democratic Governance. Accountable government in a society ‎provides the citizens with public trust, increasing thier public participation in ‎political and social context. ‎ Therefore, this research investigated the impact of public accountability on ‎increasing the citizens´ public trust and public participation in the 22 areas of ‎Tehran city. Methodology of this research is measurable-correlation, which is ‎based on structural equation modeling. The findings of this research indicated ‎that public accountability can affect both public trust and public participation.‎