US TV
The Emmy-nominated series, which is set in a 1960s advertising office and stars John Hamm and Elisabeth Moss, recently drew in 4.5m viewers for its August 16 third season premiere.
The show has been called a bona-fide pop culture phenomenon by the network's president, says Variety.
"We always saw the potential for Mad Men," AMC head Charlie Collier said. "It's been extremely gratifying to see the show develop in to such a pop cultural phenomenon with such a passionate fanbase."
Executive producer Matthew Weiner also signed a two-year deal to remain on board the series.
Mad Men won the Emmy for outstanding drama in 2008.
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