What is the translation word stalker in spanish?

There is no Word in Spanish that exactly translates the English Word "stalker". It is currently not in the Spanish Lexicon as of yet.

you would say "stalker" as the same way as in the English language.

example:

Usted es un stalker.

You could also say that a stalker is a "acosador"

example:

Vos SOS un acosador