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<i>Linguatula serrata</i> (Frölich, 1789) is a widespread parasite known as the tongue worm belonging to the family Linguatulidae. The adult form of the parasite is usually located in the upper respiratory tract of domestic and wild carnivores while the larval forms are located in the visceral organs of intermediate hosts (various herbivorous mammals). Twenty-four European brown hares (<i>Lepus europaeus</i>) were examined in this study, of which two were positive with <i>L. serrata</i> nymphs. The collected nymphs were examined morphologically using electron-microscopic analysis and molecularly by amplification of 18S rRNA and COX1 genes. Lung tissue samples were also collected and histopathological examination was performed. Histopathological examination revealed the following lesions: generalized inflammatory oedema, granulomas with necrosis, calcification and fibrosis in the bronchial tree. The results of molecular sequencing for <i>L. serrata</i> specimens collected from the European brown hares are deposited in GenBank. This study presents the first report on <i>Linguatula serrata</i> nymphs collected from <i>L. europaeus</i> in Romania, using molecular and morphological characterization simultaneously.