There are many great film noir movies that are considered classics of the genre. Some of the best include:
The Maltese Falcon (1941)
Double Indemnity (1944)
The Big Sleep (1946)
Out of the Past (1947)
The Third Man (1949)
Sunset Boulevard (1950)
The Night of the Hunter (1955)
These films are known for their moody, atmospheric style, complex characters, and moral ambiguity.
Do you have a specific one in mind that you would like to know more about?