Was Voldemort from the Harry Potter movies played by a real actor?

Yes, Lord Voldemort was played by a real actor in the Harry Potter movies.

However, it's a bit complicated:

* Ralph Fiennes played the adult Voldemort in most of the films.

* Christian Coulson played a young Voldemort in the film "Harry Potter and the Chamber of Secrets."

* Hero Fiennes Tiffin (Ralph Fiennes' nephew) played a teenage Voldemort in "Harry Potter and the Half-Blood Prince."

So, while Voldemort was a fictional character, he was brought to life on screen by multiple real actors.