Alpha Mensa V was an planet located in the space of the galaxy's Beta Quadrant, the fifth planet in orbit of the Alpha Mensa star system.

In the early 23rd century, this was a colony world, home to a Federation population. Alpha Mensa V was a childhood home of Hikaru Sulu. (TOS novel: Spock, Messiah!)

The novel Spock, Messiah! noted this world to be Sulu's birthplace, but canon later established he had been born in San Francisco in TOS movie, novelization & comic adaptation: The Voyage Home.

By the later 24th century, Alpha Mensa V was located in the Romulan Neutral Zone, and was noted to be uninhabited. (ST reference: Star Charts)