http://www.openculture.com/free_film_noir_movies

A Life at Stake – Free – Directed by Paul Guilfoyle, this American noir film stars Angela Lansbury and Keith Andes. (1954)Beat the Devil – Free – Directed by John Huston and starring Humphrey Bogart, the film is something of a comic and dramatic spoof of the film noir tradition. (1953)

Behind Green Lights – Free – Stars Carole Landis, John Ireland. Police lieutenant Sam Carson investigates a political murder after the victim is dumped at the door of police headquarters. (1946)

Big Bluff – Free – Directed by W. Lee Wilder. When a scheming fortune hunter finds his rich wife is not going to die as expected, he and his lover make other plans to get her millions. (1950)

Blonde Ice – Free – A society reporter keeps herself in the headlines by marrying a series of wealthy men. They all die mysteriously afterwards though. (1948)

Borderline – Free – Fred MacMurray and Claire Trevor are caught in Mexican dope-smuggling ring, fearing each other is involved, but both undercover agents. Alternate version. (1950)

Club Paradise – Free – The film, also known as Sensation Hunters, was directed by Christy Cabanne. The story: a touching story of girl who like many others makes the wrong choice in life – and pays for it. (1945)

Convict’s Code – Free – An ex-con is employed by the man who framed him for bank robbery. Directed by Lambert Hillyer. Starring Robert Kent and Anne Nage. (1939)

Dementia – Free – Also called Daughter of Horror, this film by John Parker incorporated elements of horror film, film noir and expressionist film. About the film, Cahiers du cinema wrote “To what degree this film is a work of art, we are not certain but, in any case, it is strong stuff.” (1955)

Detour – Free – Edgar Ulmer’s cult classic noir film shot in 6 days. (1945)

D.O.A. – Free – Rudolph Maté’s classic noir film. Called “one of the most accomplished, innovative, and downright twisted entrants to the film noir genre.” You can also watch the movie here. (1950)

Fear in the Night – Free – Low budget noir film directed by Maxwell Shane & starring Paul Kelly and DeForest Kelley. It is based on the Cornell Woolrich story “And So to Death”. (1947)

Five Minutes to Live – Free – Amazing bank heist movie stars Johnny Cash, Vic Tayback, Ron Howard, and country music great, Merle Travis. (1961)

Guest in the House – Free – Directed by John Brahm, the noir film stars Anne Baxter, Ralph Bellamy, Aline MacMahon. (1946)

He Walked by Night – Free – Film-noir drama, told in semi-documentary style, follows police on the hunt for a resourceful criminal. This move became the basis for “Dragnet,” and stars Jack Webb. Archive.org version here. (1948)

Impact – Free – Arthur Lubin’s well reviewed noir flic. Considered a little known classic you need to watch. (1940)

Inner Sanctum – Free – A gripping noir film about “a murderer who is on the lam and hiding out in a small town. Unbeknownst to him, he is not only hiding in the same boarding house as the only witness to his crime, he is sharing the same room.” (1948)

Jigsaw – Free – Directed by Fletcher Markle, and starring Franchot Tone, Jean Wallace and Marc Lawrence, the film features cameo appearances by Marlene Dietrich and Henry Fonda. (1949)

Johnny O’Clock – Free – Directed by Robert Rossen, based on a story by Milton Holmes. The drama features Dick Powell, Evelyn Keyes, and Lee J. Cobb, with Jeff Chandler making his film debut in a small role. (1947)

Kansas City Confidential – Free – A film noir gem that inspired Quentin Tarantino’s “Reservoir Dogs.” (1953)

Key Lime Pie – Free – A zany animated film in the noir tradition. (2007)

Lady Gangster – Free – Warner Bros. B picture directed by Robert Florey based on the play Gangstress, or Women in Prison, by Dorothy Mackaye, Stars: Faye Emerson, Julie Bishop, Frank Wilcox, Roland Drew, and Jackie C. Gleason. (1942)