A longsword (also spelled as long sword or long-sword) is a type of European sword characterized as having a cruciform hilt with a grip for primarily two-handed use (around 15 to 30 cm), a straight double-edged blade of around 80 to 110 cm, and weighing approximately 2 to 3 kg.

The "longsword" type exists in a morphological continuum with the medieval knightly sword and the Renaissance-era Zweihänder.