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Studies on diversity of fungi colonizing and damaging different plant parts of oregano (Origanum vulgare L.) were carried out in 2012–2014 on production plantations grouped in south-eastern Poland. Fungi were isolated from superficially disinfected roots, stems and leaves using mineral medium. Fungi from Fusarium spp., Boeremia exigua var. exigua and Rhizoctonia  solani were obtained from the roots and stems showing necrosis and tissue disintegration. Alternaria alternata and Stemphylium botryosum were isolated from the leaves with symptoms of irregular, necrotic spots. Colletotrichum fuscum was commonly obtained from the leaves showing symptoms necrotic, concentrically zoned spots with lighter center and the slightly raised edge. This species had not been found in Poland earlier.