Organic agriculture is a rapidly growing segment of most developed agricultural economies around the world. To stimulate growth and circumvent supply-side market failures that emerge when organic products are not segregated, governments have introduced regulations concerning the certification and labeling of organic food. While certification and labeling satisfy market demand for information provision, the introduction of these activities creates incentives for the mislabeling of conventional food as organic. Despite the incentives for, and the incidence of mislabeling in organic food product markets, this issue has not been analyzed systematically. In fact, the possibility of mislabeling has been customarily neglected by economic studies of markets for credence goods in general. This paper addresses the issue of product type misrepresentation in organic food product markets and develops a model of heterogeneous consumers that examines the effect of mislabeling on consumer purchasing decisions and welfare. Analytical results show that, contrary to what is traditionally believed, while certification and labeling are necessary, they are not sufficient for alleviating failures in organic food product markets. The effectiveness of labeling depends on the level of product type misrepresentation. Consumer deception through mislabeling affects consumer trust in the labeling process and can have detrimental consequences for the market acceptance of organic products. When extensive mislabeling occurs, the value of labeling is undermined and the organic food market fails.