This report assesses the impact of participation in farmer organizations (FOs) on food security of rural households in Cambodia. The study is particularly set out to following: (1) examine FOs’ roles and operation and challenges for improving household’s food security; (2) analyze household’s characteristics that determine participation in FOs; (3) assess the impact of FOs on food security and livelihood of the rural poor; and (4) provide specific recommendations for changes in relevant legal acts and regulatory frameworks associated with FOs.