This document provides information on Mongolia's progress in implementing the Paris Declaration on Aid Effectiveness. It finds that Mongolia has registered mixed progress, meeting two of thirteen targets but seeing marginal or no progress on most others. Net official development assistance to Mongolia totaled $417 million in 2009. While Mongolia has strengthened some capacities through coordinated support, alignment of aid to national priorities and predictability of aid have seen setbacks. Harmonization indicators are also below targets. The role of both donors and the Mongolian government in increasing effectiveness is discussed.