The shawm is a conical bore, double-reed woodwind instrument made in Europe from the 12th century to the present day. It achieved its peak of popularity during the medieval and Renaissance periods, after which it was gradually eclipsed by the oboe family of descendant instruments in classical music. It is likely to have come to Western Europe from the Eastern Mediterranean around the time of the Crusades. Double-reed instruments similar to the shawm were long present in Southern Europe and the East, for instance the ancient Greek, and later Byzantine aulos, the closely related sorna and zurna, and the Armenian duduk.

In music, the bore of a wind instrument is its interior chamber. This defines a flow path through which air travels, which is set into vibration to produce sounds. The shape of the bore has a strong influence on the instrument's timbre.