"The Last Defender of Camelot" is a fantasy short story by American writer Roger Zelazny, first published in the Summer 1979 issue of Asimov's SF Adventure Magazine.

He must help Morgana le Fay confront Merlin, who is half-mad and attempting to meddle in the affairs of the world.

Lancelot has remained alive since the fall of Camelot, having the appearance of an elderly man but retaining his strength and fighting skills.

Morgana warns Lancelot that Merlin will cause great harm in his misguided attempts to right the wrongs of the modern world, and that he must be stopped.

Merlin summons a "hollow knight" (a suit of armor animated by a spirit) to kill Lancelot.