The Romulans are an extraterrestrial race in the American science fiction franchise Star Trek. Their adopted home world is Romulus, and within the same star system they have settled a sister planet Remus. Their original home world, Vulcan, was renamed Ni'Var later in canon. They first appeared in the series Star Trek (1966–1969). They have appeared in most subsequent Star Trek releases, including The Animated Series, The Next Generation, Deep Space Nine, Voyager, Enterprise, Discovery, Picard, Strange New Worlds, and Lower Decks. They appear in the Star Trek feature films Star Trek V: The Final Frontier (1989), Star Trek VI: The Undiscovered Country (1991), Star Trek: Nemesis (2002) and Star Trek (2009). They also appear in various other spin-off media, including books, comics, toys and games.

Vulcans, sometimes referred to as Vulcanians, are a fictional extraterrestrial humanoid species in the Star Trek universe and media franchise. In the various Star Trek television series and films, they are noted for their attempt to live by logic and reason with as little interference from emotion as possible. Known for their pronounced eyebrows and pointed ears, they originate from the fictional planet Vulcan. In the Star Trek universe, they were the first extraterrestrial species to make contact with humans.