Veganopia

Peaceful, idyllic societies have a tendency to be vegetarian (if not vegan) in fiction. As often as not, these societies are portrayed as being morally, perhaps even spiritually/magically superior to our own, implying that humanity's meat-eating habit is somehow holding us back from living in a world of Crystal Spires and Togas. Sometimes it can be downright Anvilicious.

Some cases aren't so focused on the evils of eating animals so much as how circumstances might force people to adopt a vegetarian diet. See Future Food Is Artificial for examples of this.

Probably stems from the issues raised by Carnivore Confusion and Let's Meet the Meat. See also Mary Suetopia and Perfect Pacifist People.

Comic Books

 * Parodied by Frank Miller in Tales to Offend #1 where a woman from a typical Veganopia is rescued from a rampaging dinosaur by 'real man' Lance Blastoff. She starts to berate Lance for his unenlightened ways but is overwhlemed by the smell of the roasting dinosaur and immediately begins gorging herself on the freshly killed and cooked meat.
 * The Smurfs are portrayed mostly as vegetarians, though sometimes they will be shown eating meat-based products. However, where they get the meat is anybody's guess.

Film

 * In Logan's Run (at least the movie), it seems the characters are vegan: when faced with the concept that humans once raised animals for food, Jessica remarks that "it must have been a savage world". Of course, what they don't know is that their own food source died out years ago and they've been eating frozen people for decades.
 * Eternia is a Veganopia in the Masters of the Universe movie, and has apparently been that way for a very long time, to the point that Teela doesn't realize that the ribs she eats after coming to Earth are actually meat. When Man-At-Arms informs her of this fact, she's suitably disgusted. On the other hand, he doesn't seem to mind.
 * He's a veteran of several wars and has probbably eaten far worse to survive.
 * Subverted in Troll 2 They eat people... but only after turning them into plants.
 * The United States becomes this in Escape From L.A., when an uber-Christian man is elected President-for-life and imposes new laws for the "Moral America", such as no smoking, drinking, red-meat-eating, guns, swearing, non-Christian religions, or premarital sex. Anyone who disagrees is kicked out to live in Los Angeles, which has been separated from the mainland by an earthquake and turned into a penal colony. It's hardly a utopia, though. In fact, the President's plan is to use a series of EMP Kill Sats to cripple the rest of the world and conquer it.
 * In Demolition Man, San Angeles has outlawed meat, along with cigarettes, alcohol, and swearing.

Literature

 * Technology similar to the uterine replicators in Lois McMaster Bujold's Vorkosigan Saga allows people to create "vat protein" with no animals being harmed. No one is a true vegan, but when forced to eat meat from a real animal, Cordelia is distinctly uncomfortable. How "vegan" this situation is proves debatable in Ethan of Athos, where the reader is shown just where the protein in those vats comes from when the characters use the animal protein reclamation system to covertly dispose of a dead body.
 * In Arthur C. Clarke's 3001: The Final Odyssey, the future human civilisation is portrayed as vegetarian and disgusted by the idea of eating animals; however, they do create dishes which imitate the taste of meat.
 * In Arthur C. Clarke's short story The Food of the Gods, the fact that synthetic foods are designed to imitate the taste of meat is not mentioned in polite society, and the narrator's testimony on that point nearly causes one member of a Congressional committee to become physically ill.
 * In Samuel Delany's Stars in My Pocket Like Grains of Sand, the enlightened human narrator is shocked at the idea of eating meat from what had been a living animal... being much more comfortable eating vat-grown human flesh.
 * Humans in James Gurney's Dinotopia are generally vegans -- "No milk, no meat, and no eggs." Not that milk is easy to come by, given that the only large mammals on the island live in inhospitable mountains. And when the local cow- and chicken-equivalents are the sentient dinosaurs who make up a large portion of the population, well... They used fish as part of diplomatic terms with some T-Rexs so fish seem OK.
 * Material in subsequent books (including a mammoth being milked in Journey to Chandara and mentions of shellfish catching in Hand of Dinotopia) suggest that most of Dinotopia is actually pescatarian.
 * In Frank Herbert's Con Sentiency series, most people no longer eat animals for meat. Meat (or at least protein) is produced in flesh vats.
 * The future humans in Anne McCaffrey's The Ship Who Sang universe are all vegetarians, except for some "backward" Mutants.
 * The elves in Christopher Paolini's Inheritance Cycle are revealed to be vegans. Which is rather funny, considering the first elf introduced in the series was wearing leather armour. According to Word of God, said leather-wearing elf doesn't give a flying nut about her culture's stigma of using animal products, though she does not eat meat.
 * Subverted with the Galactic Federation from John Ringo's Legacy of the Aldenata, who are all not so much vegetarians as outright herbivores, and are in fact incapable of killing a living animal (a major plot point). The Darhel, one of the four races that make it up, are very obviously naturally carnivorous, with sharp, needle-like teeth. All of them are technologically far more advanced, claim moral superiority,
 * Subverted in Animorphs: Andalites eat by absorbing nutrients through their hooves from whatever plants are underfoot. The Andalite Chronicles has Elfangor and Arbon disgusted by Chapman's description of mankind's omnivorism. On their homeworld and Dome ships, they are vegans, simply because of the terrain, but on Earth, Ax often accidentally finds himself "eating" worms, ants, et cetera, with no moral qualms. When Ax morphs human, he becomes an Extreme Omnivore, completely overwhelmed by his greatly-amped sense of taste. Perhaps the initial disgust was related to how humans eat rather than what. Putting something covered in bacteria inside your body while risking choking on it is seen as disgusting. The Andalites are also an aversion in that the narration doesn't treat them as morally superior for being herbivores, and in fact their species is closer to being Proud Warrior Race Guys, than the usual pacifists of the trope.
 * Then there are the Hork-Bajir, which were genetically-engineered to eat tree bark, and to be unintelligent and peaceful. (The species who created them, the Arn, needed someone to take care of the trees they spliced to replenish their planet's oxygen after an asteroid caused massive damage, but didn't feel like dealing with the trees or the Hork-Bajir personally, and so segregated the planet so that the Hork-Bajir were completely unaware of the Arn's existance.) Though it's more to do with their placid nature than their diets, until the Yeerk invasion, Hork-Bajir didn't even have a concept of violence.
 * The peaceful Eloi in H.G. Wells's The Time Machine were vegans. (However, they weren't especially bright.) They didn't have much of a choice though, since all other animals were (at least locally) extinct by then. Not to mention that the Morlocks treat them as cattle.
 * In his Island of Dr. Moreau, the strict Laws under which the beast-men live forbid them from consuming meat. This isn't imposed for moral reasons, but because their creator fears (rightly) that tasting flesh will accelerate the mental reversion of any beast-man that was created from a carnivore.
 * In the Mercedes Lackey/Piers Anthony novel If I Pay Thee Not In Gold, one of the societies the heroine encounters is like this. Subverted in that their better health and such is just an illusion. They wear masks to hide their age, and the elders "go on a quest" when they reach a certain age. (Actually they die and the bodies are hidden.)
 * In Lord of the Rings, Tolkien's Elves, nature spirits (Beorn, for ex.), and Maiar tend to be like this, as was Beren. They generally favour bread and milk rather than vegetables, though.
 * Beren is specifically said to have given up meat because of the aid animals gave him during his adventures. The Laiquendi or 'Green Elves' also seem to be vegetarian but the Noldor and Sindar most certainly are not as hunting is a favoured pastime and the Valar include Orome, a huntsman.
 * Many Fairies in Artemis Fowl are vegetarians, and, if their society is not a utopia, they certainly think it is better than human civilization. Objectively it is not so different from human civilization. Some fairies are dim witted, some are noble, some shallow and some treacherous.
 * The Star Wars Expanded Universe has Ithorians, a.k.a. "hammerheads". They're pacifists who don't eat meat and tend to sentient trees. It's also averted by Yoda, who despite being an old wise Jedi, has more issues with Luke's artificial food than with actual meat.
 * Another example are the Advozsec who are all vegetarians as they can't digest meat.
 * The Kindar in the Green-Sky Trilogy. Justified somewhat by the fact their social structure was engineered since day one to make violence of any kind unthinkable. Their Erdling brethren are omnivores, mostly because their underground-dwelling condition isn't conducive to harvesting and agriculture. This also features as a game mechanic in the video game adaptation; Kindar take a hit to their spirit stat if they eat meat while Erdlings are unaffected.
 * In the (rather odd) novel Cat Karina, eating meat or working metals are both illegal in the far future, presumably to discourage a return to technological warfare. Nevertheless, the most popular food is the "tortuga": a type of turtle, presumably genetically engineered, which grows a spherical, softened shell after breeding and is marketed as a delicious fruit.
 * In Anne McCaffrey's Dinosaur Planet, vegetarianism is legally mandated by The Federation, to such a strict degree that omnivorous species must unanimously swear off meat or be kicked out of the FSP. "Reversion" to hunting for meat is portrayed as a heinous crime, and leads to mutiny when the heavyworlders indulge in this forbidden practice.
 * In the Planet Pirates series in the same 'verse, it's not quite so hard-line. Fish are eaten on colony worlds, while the heavyworlders and Seti ignore the rule on their own worlds. "Don't ask, don't tell" seems to be the effective rule.
 * In Umberto Eco's novel Baudolino, during their journey, the main characters pass through a village of gymnosophists, people who wear no clothes, have no possessions and eat only fruits that grow naturally.
 * The society in the Uglies trilogy is at least vegetarian; upon arriving at The Smoke, Tally is disgusted by the main course meal of rabbit stew because eating meat is seen as cruel and uncivil in her home society.
 * S.L. Viehl's Jorenians—despite being pastoralists descended from predators—are vegetarians (although Xonea Torin tries shrimp alfredo with scarcely a comment in Beyond Varallan). Zig Zagged in that they're portrayed as both a Superior Species (if mainly because Humans Are Bastards in the Stardoc-verse) and a Proud Warrior Race (albeit one wearing the Cultured Warrior hat).
 * Left Behind's Kingdom Come has everyone in the Millennial Kingdom (including the animals) go vegetarian. The meat restriction was only lifted for the wedding feast at the beginning of the Millennium.

Live Action TV

 * Star Trek
 * Vulcans -- which serve as the "morally-superior" race, at least in their own minds. However there are plants, and then there are Vulcan plants. In a Star Trek novel set on Spock's homeworld, the characters are attacked by a mobile, shrieking, prey-stalking carnivorous plant native to the region ... and after it's been phasered to death, Spock eats some of it. One of the early TOS novels postulated that Vulcans were vegetarians partly because the herbivores previously used as meat died off during Surak's time. The most common reason given for their vegetarianism is the same one that led them to pacifism. They are such a violent and destructive race that they have to go to extreme lengths to not destroy themselves/conquer the universe/destroy the universe.
 * Riker eats eggs (Owon Eggs), Heart of Targ, gagh (live and dead), pipius claw... but claims people have moved beyond enslaving animals. Perhaps this refers to raising livestock as opposed to wild animals.
 * Veganism seems common on Federation ships due to access to replicators that can create very convincing meat substitutues, avoiding the need to keep the real stuff in storage on long voyages. Attitudes about veganism vary widely, from disdain toward the concept of eating meat -- like Riker claiming they don't enslave animals for food anymore, to acceptance -- like Picard importing genuine seafood at what was implied to be great expense to eagerness: Dax and other patrons of Klingon cuisine complaining that their gagh is too dead.
 * In an episode of Sapphire and Steel, humans from the far future are all vegan. Perhaps atypically, this has nothing to do with any sense of immorality about eating meat: humans of the future find animals disgusting and unclean and have exterminated all of them.
 * Along vaguely similar lines, eating meat (or at least beef) is illegal in the near-future world of SeaQuest DSV, it seems, because the ecologically-minded folks of the late 2020s did not like the atmospheric implications of keeping large numbers of cows around.
 * Doctor Who: In the successful hippie commune of the Third Doctor serial "The Green Death", the local Marty Stu is on the hunt for a mushroom that tastes like meat, with the implication that it would eliminate the need for meat, and therefore meat-eating altogether.
 * Jack Vance maliciously subverts this in The Book of Dreams by describing a world in which a colony of fanatical human vegetarians degenerated into mindless grazing animals.

Religion

 * In the Garden of Eden, Adam and Eve are told they may eat the fruit of any tree in the garden (except, you know, that one). While Able raised animals for sacrifice after the Fall, humans aren't specifically told by God that they may eat meat themselves until after Noah's Flood - though of course some may have; given that the whole reason behind the Flood was mankind's great quantity of sin, chowing down on critters may have been on the list.
 * Later imagery of peace records the lion laying down with the lamb. When the utopia is great enough, even obligate carnivores can be changed into vegans.

Tabletop Games

 * In GURPS Transhuman Space, "fauxflesh" has led to the European Union becoming a slight Veganopia. The absence of "fauxfish" means that there's still aggressive aquaculture, though.
 * Fauxfish exists, it's just more expensive than the real thing, while fauxbeef, -pork, and -chicken are all cheaper. And the aquaculture Mega Corps have spent a lot on memetic engineering to convince people that a slab of fauxoyster just isn't the same as prying a real one out of its shell.
 * Subverted in Traveller where the K'kree are fanatics devoted to annihilating all carnivores.
 * Their definition of carnivore being "any organism that feeds on animals in any way whatsoever". This includes fungi and bacteria.
 * It's implied that the Tau of Warhammer40000 are like this, and indeed may have evolved from plains-dwelling grazing animals, though more in expanded universe literature then the actual game. Most prominently in the form of the Alien Lunch served in one of The Last Chancers novels, "Kill Team".

Video Games

 * Inverted with the Wood Elves in The Elder Scrolls universe, who religiously are obliged to follow the "Green Pact" and only eat meat to protect their sacred plants. Culturally, they are also obliged to eat their fallen enemies after killing them in battle.
 * Harvest Moon games all take place in a pescatarian society (i.e. they eat fish, but not meat). Of course, since the idea of the game is to make you care for your animals, it would be a little cruel to be able to eat them as well.
 * Rune Factory games take place in the same sort of society, but it's probably more because monsters vanish as soon as they're defeated than any moral conflict.

Web Comics

 * In the space arc of Arthur, King of Time and Space, Arthur asks Guenevere if she's ever wondered why some flavours are named after animals. She doesn't want to know.

Western Animation

 * Subverted in Johnny Test when Johnny comes across a Veganopia that is revealed to be so only because they trash other planets. (But the Big Bad Alien's daughter decides that this was against the spirit of their society, so it may turn into a true Veganopia later.)
 * It is suggested that the Air Nomads in Avatar: The Last Airbender were vegetarians, due to the belief that all life is sacred
 * Being ponies, it makes sense that the ponies (and for some reason, dragon) in My Little Pony are all primarily vegetarians, though they do seem to enjoy dairy (chocolate milk) and eggs.

Real Life

 * Real-Life Exception (sort of): The ancient Assyrians were a culture of almost-vegetarian agrarians and a cruel warrior race who brutally tortured and killed those they defeated.
 * The entire Columbian exchange provides a notable aversion: Most peoples in the Americas were quite carnivorous. One result being that, as the carbohydrate crept into these peoples' diets (often by force), an increase in diabetes.
 * Given the rising human population, many scientists are predicting that the world will have to drastically if not totally reduce the amount of meat produced due to it being an extremely inefficient way of producing food in terms of land and energy requirements. Of course, this seems more like a dystopian scenario than a utopian one.
 * An inversion similar to the above: about 1/3 of the Earth's population are vegetarian, not by choice; they just can't afford to regularly eat meat.
 * One of the most common tenets of ascetic living (regardless of creed) is forgoing meat and other animal derived foods. Even practitioners who don't espouse some greater than average respect for animals feel that such products are a luxury that they are better off without and some even link abstinence from meat to improved spiritual or mental abilities.