Jack Nicholson's character in the movie "The Shining" is named Jack Torrance. Jack Torrance is a writer and the protagonist of the film, who takes a job as the winter caretaker of the isolated Overlook Hotel. Throughout the story, Jack Torrance becomes influenced and ultimately consumed by the malevolent forces within the hotel, leading to his descent into madness. Nicholson's performance as Jack Torrance is highly memorable and has become one of his most iconic roles.