I have so many reviews and commentaries about movies that portray narcissism and other Cluster B disorders such as BPD that I realized it needed to be a topic in the header.
I am not including documentaries in this list, just theatrical films.

Narcissism and Psychopathy

“Risky Business” (1983)

“Ordinary People” (1980)

“Ferris Bueller’s Day Off” (1986)

“We Need to Talk About Kevin” (2011)

Article from another source about movies that portray NPD.
A Streetcar Named Desire
Black Swan
Lucy in the “Peanuts” comic strips (I know it’s not a movie, relax)
Gaslight
Mommie Dearest
Schindler’s List

Borderline Personality Disorder

“Welcome to Me” (2015)

“Mary Jane Harper Cried Last Night” (1977 TV movie)

Other

“Inside Out” (2015) — not really about narcissism, but about emotions and how they work.