The popular horror writer told Parade that he does not watch the award-winning AMC drama and that he prefers ABC series Revenge.
"I don't watch Mad Men," he said. "I think it's basically soap opera, and if I want soap opera, I watch Revenge. That show is crazy, but they have great clothes."
King also listed The Walking Dead among his favourite television shows - the scribe was at one point rumoured to be in talks to co-write an episode of the zombie drama with his son Joe Hill.
Under the Dome - a television adaptation of King's 2009 sci-fi novel - will premiere on CBS on Monday, June 24.
JJ Abrams (Star Trek Into Darkness) is also in talks to adapt the author's 2011 novel 11/22/63 into an ongoing TV drama.
> Stephen King not keen on Shining movie prequel
Watch a trailer for the sixth season of Mad Men below: