What is the name of the captain who narrates Frankenstein's story?

The captain who narrates Frankenstein’s story is Robert Walton.

Walton is an English sea captain and explorer leading an expedition toward the North Pole. Mary Shelley presents the opening and closing sections of the novel as letters Walton writes to his sister, Margaret Saville. This letter-based structure makes him the novel’s outer or frame narrator.

During the voyage, Walton’s crew discovers Victor Frankenstein weakened on Arctic ice. Victor then tells Walton the story of his experiments, the creation of the creature, and the tragic consequences that follow. The narrative therefore contains several layers: Walton’s letters surround Victor’s account, which includes the creature’s own story.

Readers sometimes answer Victor Frankenstein because he narrates most of the central events. However, Victor is the principal storyteller within Walton’s frame, not the captain who records and introduces the tale. Robert Walton is the single canonical answer to this question.