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In this work, an interesting application of phytochemistry for ethnopharmacological purposes was reported. In particular, the total phytochemical analysis of a single sample of Ajuga reptans L. (Lamiaceae) collected in Central Italy was carried out in order to provide a rationale for the use of this plant in folk medicine. This analysis was conducted on the volatile oil fraction by gas chromatography–mass spectroscopy (GC-MS) and on the polar one by means of classical column chromatography and nuclear magnetic resonance and MS. Thirty-nine volatile components were identified in the essential oil whereas 32 compounds were identified in the polar fraction. All of these are known to exert several beneficial medicinal activities and no potentially toxic compounds were identified such as the neo-clerodane diterpenoids, commonly evidenced in the entire genus. This study could provide a phytochemical rationale for the possible ethnopharmacological use of this specific species.