In September 2011, black leaf mold caused by Pseudocercospora fuligena occurred on tomato plants growing in protected cultivation conditions in Boryong and Buyeo, Chungnam Province, Korea. Symptoms of the disease initially appeared as foliar chlorotic spots on upper leaf surfaces, turned light brown and then black on lower leaf surfaces as the fungus sporulates profusely. The causal fungus was isolated from the diseased plants and identified as P. fuligena based on morphological characteristics. Pathogenicity of the fungus was proved by artificial inoculation in the green house. This is the first report of the occurrence of black leaf mold of tomato caused by P. fuligena in Korea.