Fight between two people armed with weapons. A duel is usually fought according to pre-arranged rules with the aim of settling a private quarrel.

In medieval Europe duels were a legal method of settling disputes. By the 16th century the practice had largely ceased but duelling with swords or pistols, often with elaborate ritual, continued unofficially in aristocratic and military circles until the 20th century. In some German universities exclusive duelling clubs continue to this day.