The person or the "voice" whose viewpoint is used in telling a story.(noun)
The person providing the voice-over in a documentary.(noun)
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Use "narrator" in a sentence
"Donnie, after losing his job 6 months ago, which caused him to lose his house and truck, is now residing with his mother, and is still "reluctant" (the term narrator Julia Preston uses) to apply for the minimum wage jobs the illegal immigrants did."
"I undestand that the narrator is an Easterling himself; in that case he wouldn't call it an "Easterling style"."
"Unless the narrator is actually a character in this story?"