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MUST SEE:
Night Of The Living Dead (1968)
Dawn of the Dead (1978)
Day of the Dead (1985)
Carnival Of Souls (1962)

Some other good ones:
Night of the Creeps (1986)
Night of the Comet (1984)
The Crazies (1973)
[This story is a bit different from others, it is about a military vaccine experiment gone wrong, a vaccine that turns people into violent crazy zombie-like murderers.]
The Hills Have Eyes (1977)
[Not exactly a zombie film but a good horror flick. A family taking a road trip finds themselves stranded in the Nevada desert who run into an inbred family of cannibals who lived near a nuclear test site.]
Welcome To Raccoon City (2021)
[Based on the Resident Evil video game series.]
White Zombie (1932)