One wonders how In the Mouth of Madness might have turned out if the script had contained even a little more wit and ambition.

Roger Ebert

Chicago Sun-Times

In the Mouth of Madness has enough menace and novelty to please fans of Mr. Carpenter's horror films (among them The Fog, Christine and Halloween) without the wider interest of an enchanting parable like Starman, which he also directed. Still, this is a film with the temerity to think big, if only for the magnitude of the wickedness it invokes.

Janet Maslin

The New York Times

Fans can console themselves with some disorientating creepiness as half-glimpsed monsters swarm and the fine melodramatic performances. But as the film descends into a babbling wreck you start to wonder whatever became of the directing talent that gave us Dark Star, Assault On Precinct 13, Halloween and The Thing.

Kim Newman

Empire