From Muppet Wiki

Sir Michael Hordern (1911 - 1995) was a British actor in film, stage, television, and radio, who supplied the voice of The Wiseman in Labyrinth.

Hordern's film roles included such varied productions as The Spy Who Came in from the Cold, Gandhi, The VIPs, Theater of Blood (with Vincent Price) and A Funny Thing Happened on the Way to the Forum (with Zero Mostel). In television, he was especially active as a voice actor, narrating The Adventures of Paddington Bear and playing Badger in the stop-motion Wind in the Willows. His BBC radio roles included P.G. Wodehouse's Jeeves and J. R. R. Tolkien's Gandalf.