Me, Natalie (1969)

Technically, Pacino only has one short scene in this 1969 movie starring Patty Duke — but it’s his first on-screen role in a feature, so it’s worth noting.
The film follows Duke as Natalie, a so-called “ugly ducking” who moves to Greenwich Village and meets an artist there.
If you don’t want to watch the whole movie, you can catch Pacino’s scene here — but be warned, his character is not very likable. Hey, they can’t all be chivalrous!