Organic agriculture has received widespread attention in the past. A contested issue in connection with recent organic agriculture developments, however, is its impact on household food security. By using examples from Uganda, this article asks how organic agriculture is able to achieve household food security. In this context, unavailability, inaccessibility and the improper utilisation of food are suggested as the main causes for food insecurity. Based on five mechanisms, organic agriculture contributes to mitigate food insecurity through processes of agricultural intensification, economic specialisation and social mobilisation. We conclude that organic agriculture has sufficient leverage to achieve food security at household level. Such achievements, however, cannot always be taken for granted as food insecurity at the micro level has a distinct social, economical and political dimension at the macro level.