What is Spock's Starfleet role aboard the Enterprise?

Spock’s Starfleet role aboard the Enterprise is science officer.

In Star Trek: The Original Series, Spock serves as the Enterprise’s science officer, applying Vulcan logic and scientific expertise to unfamiliar worlds, alien life, and physical phenomena. His role frequently places him at the center of investigations and technical decisions.

Spock also serves as the ship’s first officer, making him second-in-command under Captain James T. Kirk. That additional duty is why descriptions of Spock sometimes list both positions, but “science officer” is the specific role contrasted with the medical, communications, and engineering choices in this quiz.

Leonard Nimoy’s performance made Spock one of the franchise’s central characters. His half-human, half-Vulcan heritage creates a recurring tension between emotion and logic, while his scientific training gives the bridge crew an analytical perspective. Dr. Leonard McCoy handles medicine, Lieutenant Uhura communications, and Montgomery Scott engineering.