The family show, which has featured stars such as Anthony Head, Richard Wilson and John Hurt, has been commissioned for a fourth run.
The third series has been drawing audiences of six million on BBC1 each week. Its current run will wind up with an edge-of-the-seat climax on December 4.
Ben Stephenson, the BBC’s controller of drama commissioning, said: “Merlin continues to perform outstandingly well against X Factor and offers audiences an alternative treat on Saturday nights.
“I’m pleased to confirm that the magical world of Camelot will be returning next year for a fourth series of this fresh and modern retelling of a classic British legend.”
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