The television presenter admitted her dislike for the popular BBC show while filming an episode of Room 101, The Sun reports.
"I think Doctor Who is the most dreary thing," she said. "I think it's... dreary."
However, Britton confessed that she doesn't like any sci-fi, adding: "I tried to watch Star Wars three times but I've never got past the first 12 minutes as I've always fallen asleep.
"I hate sci-fi as it's not real and all these people who are fans think it's real and it's some sort of religion to them."
Last August, it emerged that Frank Skinner had signed up to host the new series of Room 101, taking over from previous presenter Paul Merton.
Britton will appear in the first episode of the new series with Robert Webb and Danny Baker, while future guests include Nick Hewer, Alice Cooper, John Prescott, Gregg Wallace, Larry Lamb, Sarah Millican and Chris Tarrant.
Room 101 returns on Friday at 8.30pm on BBC One.