McQ is a 1974 crime/drama film starring John Wayne, Eddie Albert, Diana Muldaur, and Colleen Dewhurst. The film made extensive use of actual Seattle locations. The beach scenes were filmed on the Pacific coast at Moclips.

Lieutenant Lon McQ (Wayne), a detective with the Seattle Police Department, investigates the murder of his longtime friend and partner. In so doing, he faces corruption in the police department related to confiscated illegal drugs.

Wayne turned down the lead in Dirty Harry a few years prior to this film, although the producers chose Seattle as an earlier site to film there. It was later changed to San Francisco when Clint Eastwood became connected with the project.

McQ features a young Roger E. Mosley as a pimp; the villain in the film, Santiago, is portrayed by Al Lettieri in one of his final roles.

The film is noted for introducing the MAC-10 submachine gun to the general public and creating a demand for it.

Police Lieutenant Lon McQ investigates the killing of his best friend and uncovers corrupt elements of the police department dealing in confiscated drugs. Written by Jim Beaver

In Seattle, two uniformed police officers and plainclothesman Stan Boyle are found shot, the two uniformed officers to death, early one morning. Boyle's partner, Lt. Lon McQ, is certain local hood Manuel Santiago is behind these killings, especially after a known hitman employed by Santiago tries to kill McQ. Defying the orders of his superior, Captain Ed Kosterman, McQ tails Santiago. After confrontations with both Santiago and Kosterman and despite the sympathy of city councilman Franklin Toms, McQ enlists the help of private detective "Pinky" Farrell, and soon becomes involved in a major narcotics deal - one that blows up in the face of both McQ and Santiago and which leads to the discovery of a stunning secret for McQ. Written by Michael Daly