A glaive is a European polearm weapon, consisting of a single-edged blade on the end of a pole. It is similar to the Japanese naginata, the Chinese guandao, Russian sovnya and Siberian palma.

Typically, the blade was around 45 cm (18 inches) long, on the end of a pole 2 m (6 or 7 feet) long, and the blade was affixed in a socket-shaft configuration similar to an axe head, rather than having a tang like a sword or naginata. Occasionally glaive blades were created with a small hook on the reverse side to better catch riders. Such blades are called glaive-guisarmes.