Vulcans are a humanoid species in the fictional Star Trek universe who evolved on the planet Vulcan, and are noted for their attempt to live by reason and logic with no interference from emotion. They were the first extraterrestrial species to officially make first contact with Humans, and later became one of the founding members of the United Federation of Planets. Vulcans are featured in all five Star Trek series, three of which featured a Vulcan as a main character.

Vulcans are depicted as similar in appearance to humans. The main physical differences are their eyebrows and ears: the former are arched and upswept, while the latter feature pinnae which taper into a point at the top. Vulcans can be classified into various races.

Most caucasianoid-like Vulcans typically appear with a subtle greenish hue to their skin, due to Vulcans' copper-based blood. Other features described include an inner eyelid, or nictitating membrane, which protects their vision from bright lights, an adaptation for their bright and hot home world. In addition, their hearts are located on the right side of the torso, in between the ribs and pelvis, as Dr.McCoy once says about Spock:“he is lucky that his heart is where his liver should be, or he’d be dead!” (Star Trek, the Original Series [TOS] episode: “A private Little War”) Vulcans are vegetarians and were omnivores in ages past.

In the Star Trek original series (TOS) episode "All Our Yesterdays", Spock willingly consumes meat; partly due to the effects of time-travel 5,000 years into the past, and partly because he reasons there is no other suitable food available given the harsh, ice-age climate in which they are trapped. Vulcans are repeatedly stated to be herbivorous in the (non-canon) TAS episode "The Slaver Weapon", by the carnivorous Kzinti. Vulcans do not like to touch their food with their hands, preferring to use utensils whenever possible (though there are numerous cases where Vulcans have broken this rule).

It is a Vulcan custom for guests in the home to prepare meals for their hosts (“Star Trek Enterprise” episode: “Home”). Vulcans are said not to drink alcoholic beverages, though they are depicted indulging on special occasions or as a storyline warrants. In the Star Trek: Voyager episode "Repression", Humans and Vulcans are shown drinking a Vulcan alcoholic drink called "Vulcan Brandy".

In the TOS episode "The Enterprise Incident", as part of his diversionary role during an espionage mission against the Romulans, Spock shares a drink (most likely Romulan Ale) with the female Romulan commander. In a later TOS episode "Requiem For Methuselah", Spock specifically requests a Terran brandy after Dr. McCoy, while serving himself and Captain Kirk, observes that he had no expectation that Spock would be joining them in a drink for fear that the alcohol would affect his logic faculties.

In Star Trek: First Contact, when the Vulcans first met Zefram Cochrane, he served them alcoholic beverages, which they took in lieu of dancing. In "non-canon" Trek-related literature, such as the novelization of Star Trek IV: The Voyage Home, Vulcans are depicted as immune to the effects of alcohol, but become inebriated by ingesting chocolate (this is also quickly alluded to in DS9 when Quark offers a Vulcan client some Vulcan Port or chocolate, in speaking of which he implies something sexual).

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