Carpinus betulus, the European or common hornbeam, is a species of tree in the birch family Betulaceae, native to Western Asia, central, eastern, and southern Europe. It requires a warm climate for growth, and occurs at elevations up to 600 metres.
It is a deciduous small to medium-size tree reaching heights of 15–25 metres (49–82 ft), rarely 30 m (98 ft), and often has a fluted and crooked trunk. The bark is smooth and greenish-grey, even in old trees. The buds, unlike those of the beech, are 10 mm (0.39 in) long at the most, and pressed close to the twig. The wood is heavy and hard, and is used for tools and building constructions. It also burns hot and slowly, making it very suitable for firewood. Carpinus betulus is widely cultivated as an ornamental tree, for planting in gardens and parks throughout north west Europe.