Accolon /ˈækəlɒn/ is a character in Arthurian legends where he is a lover of Morgan le Fay who is killed by King Arthur in a duel during the plot involving the sword Excalibur.

She tells him he must use the weapon in his next fight with a mysterious swordsman who is actually Arthur, himself wielding a sword he believes to be Excalibur but which was actually a fake given to him by Morgan.

Neither man recognises the other but Accolon gains the upper hand due to wielding the real Excalibur, as well as its also magical scabbard, together giving its user the near invincibility in battle.

She takes revenge on Arthur by stealing Excalibur's protective scabbard (arguably more valuable than the sword itself) and then losing it to the world forever by throwing it into an enchanted lake.

For instance, the scene of his battle with Arthur is included in Marion Zimmer Bradley's The Mists of Avalon, though with the role of Nimue omitted.