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Akritirians
Hostile

First encountered in 2373. While on their planet, Lieutenant Paris and Ensign Kim were wrongfully accused of terrorist activity and sent to a prison ship. Prisoners on these ships have a clamp in their skulls that stimulate aggressive behaviour. All prisoners are sentenced to a life sentence. They are never again let out from the prison. Janeway then had to convince the party responsible for the terrorist activity, a group known as "Open Sky", to help them locate and free Paris and Kim.
(The Chute)

Alsaurian
Peaceful

Alsauria is occupied by the hostile Mokra and held under siege. People protesting against their regime are sent to an impenetrable prison.
(Resistance)

Antarian
Peaceful

Voyager entered the Antarian Trans-stellar Rally in 2377 to provide a "neutral ground" for the pre- and post-race activities. The race was a way to maintain the fragile peace among the principal species in the region after nearly a century of war.
(Drive)

Banean
Peaceful

The Baneans were first encountered in 2371. Lieutenant Paris and Ensign Kim were sent to their planet to help with some malfunctioning technology. They worked with a local scientist to find a solution to their problems when Paris was accused of murder. The Benaens extract memory engrams of the victim's last moments alive, which are then planted into the minds of the murderer to punish them. Paris had to repeatedly relive a crime he did not commit. Lieutenant Tuvok discovered that the engrams contained a code for various Benaen technologies, and that the Numeri, a species at war with the Benaen were using Paris to receive the code.
(Ex Post Facto)

Bomar
Hostile

A species encountered in 2374. Bomar officials were reluctant to let Voyager pass through their space. The Bomar plotted a course which proved to be more difficult than the passage around Bomar space. They had checkpoints throughout their space in order to detect alien ships and disable them. Voyager was able to find a way to fool the detectors, which proved to be very useful when Seven of Nine's proximity detector went off-sending her on an intercept course to the Borg source, and they had to follow her through Bomar space.
(The Raven)

Borg, The
Hostile

The Borg is a vast collective of humanoids that have been assimilated by the Borg Collective. These humanoids, called Borg drones, have various cybernetic implants embedded inside and outside their bodies. These implants connect all the drones to each other in a massive collective called the hive mind, which supresses each drone's individuality. Drones have the ability to adapt to enemy weapons which makes them a powerful enemy. Their main goal is to find perfection by assimilating more species and technology but they only assimilate what they think is relevant biological or technological traits. The Borg are un-emotional but efficient and can only grow in numbers by assimilation.
(Blood Fever, Unity, Scorpion, The Gift, The Raven, Hope and Fear, Drone, Dark Frontier, Dark Frontier, Survival Instinct, Collective, Child's Play, Unimatrix Zero, Endgame)

Botha
Hostile

Hostile telepathic humanoids that are very protective of their space. They are able to cause intense hallucinations in others, which can completely disable a person's sense of reality. Most vessels that enter Bothan space never return.
(Persistence of Vision)

Briori
Hostile

They abducted people from Earth in 1937 to use them as slaves on their homeworld in the Delta Quadrant. The humans revolted and took over the Briori homeworld.
(The 37's)

Brunali (Species 2461)
Peaceful

Icheb's home planet. Brunali buildings are mostly small huts since they have to keep things very low-tech or the Borg will detect them and attack the planet again. They are skilled in agricultural genetics, which allows them to grow crops in inhospitable environments Some Brunali children (like Icheb) is genetically engineered at birth with anti-Borg pathogens. Their parents raise them specifically to be assimilated, infect the Borg and stop the attacks on their planet.
(Child's Play)

Cardassians
Hostile

The Cardassian people originate from the Alpha quadrant and is considered a very cruel species. They are in conflict with the federation and the Maquis. Seska, a former Maquis and an ensign on Voyager, was found to be a Cardassian spy. She joined the Kazon and helped them to seize Voyager. In the end she died when Lieutenant Paris, the Doctor and several Talaxian ships were able to overload Voyager's Phaser couplings and free Voyager from the Kazon.
(State of Flux, Basics, Nothing Human)

Caretaker (The Nacene)
Peaceful/Hostile

 
The Nacene, who exist as pure sporocystian energy and comes from another galaxy, visited Ocampa about a millennium ago They accidentally destroyed the Ocampan atmosphere by removing all of its nucleogenic particles. This made it impossible for the planet's atmosphere to create clouds, rain or water. The Nacene felt responsible for the situation and left two chosen 'Caretakers' to provide the Ocampa with what they needed to survive without water. The Caretaker's mate, Suspiria, didn't agree with her mate on how to take care of the Ocampan species, and left together with a group of around 2000 Ocampans, which she helped to grow stronger telepathic abilities. Voyager encountered this other Caretaker in 2372.
The Caretaker was responsible for pulling Voyager into the Delta Quadrant. He needed a genetic match to produce offspring, which would take over his task as a caretaker, and pulled ships from all over the galaxy to find one. He didn't succeed and died from old age.
(Caretaker, Cold Fire)

Cataati
Hostile when desperate

The Cataati, once a proud and accomplished people, had almost entirely been assimilated by the Borg when Voyager encountered them in year 2374. The knowledge on how to create, thorium isotopes, the type of molecules that Caatati ships needed to operate was lost as well. The Cataati planned to steal Voyager's warp core and blackmail Janeway into handing over all Voyager's resources.
(Day of Honor)

Devore
Hostile

First encountered in 2375. They are paranoid humanoids who hate species with telepathic abilities because they think their mind-reading capabilities are a threat to them. They have a division of war ships that make unannounced inspections of alien space ships travelling through their space. If they find any telepaths, they are sent to concentration camps. The Devore empire runs through three sectors and contains eleven star systems.
(Counterpoint)

Dinaal
Relatively Peaceful

People on the Dinaali homeworld is assigned a Treatment coefficient, based on how useful a person is to society. This coefficient decides the amount of medical care you will receive if you get sick. The Doctor was stolen in 2377 and sold to a Dinaali hospital where he was forced to work as a physician and treat people against his ethical believes until he was able to free himself.
(Critical Care)

Dralian
Peaceful but ruthless

First encountered in 2377. Gar, a Dralian trader steals the doctor and the mobile emitter and sell them to a Dinaali hospital. He manages to free himself and give better medical care for the people of Dinaal in the process.
(Critical Care)

Drayan
Peaceful

Among the Drayan, the aging process is reversed. The older they get the younger they look. When it is time to die they look and behave like children. Drayans are brought to a sacred site on an uninhabited moon to die.
(Innocence)

"Dream Aliens"
Hostile

First encountered in 2374. They attempted to place the entire crew in a dream state. Since these aliens existed in the dream world, they used sleep as a weapon against other species. Commander Chakotay used his skills as an Indian (lucid dreaming) to find the aliens. The Doctor and Chakotay were able to wake the crew.
(Waking Moments)

Enaran
Peaceful

A telepathic species that has the ability to set telepathic links between each other and by doing that relive the others memories. In the past the Enaran feared the Regressives - a people with different believes. They started to systematically relocate and kill them. This was later forgotten and they lived as a peaceful species.
(Remember)

Etanian Order
Hostile

The Etanian Order has technology to create meteor showers or other "natural" disasters, on different planets which they take over when the inhabitants evacuate.
(Rise)

Entharan
Peaceful

A people who depend on trade. It is a serious offense if an Entharan fails to follow their protocols concerning diplomatic relations with other species.
(Retrospect)

Fen Domar
Hostile

A species that Voyager encountered a few years into the alternative future in Endgame. Janeway's favourite cup took a beating during a battle with this species.
(Endgame)

Ferengi (Species 180)
Ruthless

Voyager encountered two male ferengi on the planet Takar in the Delta Quadrant. Their advanced technology made the primitive locals worship them as gods even though the ferengi exploited them. The Ferengi homeworld is Ferenginar in the Alpha Quadrant, which is ruled by a Grand Nagus. Their culture is based entirely upon commerce and they follow a code of conduct known as "The Ferengi Rules of Acquisition". The Ferengi brain is composed of four distinct nodes and their blood is yellow. Ferengi females have smaller lobes then males and are not permitted to go out in public, hold jobs, wear clothing or participate in trade or commerce.
(False Profit)

Garan
Peaceful

Voyager encountered a Garan mining colony, close to Tak Tak space, in 2373. The colony had been infected by a macrovirus that soon infected Voyager as well. The Tak Tak destroyed the colony to make sure that the virus wouldn't spread.
(Macrocosm)

Haakonian Order
Once Hostile

The Haakonian and the Talaxian species were once at war with each other. Over 300,000 talaxians, including Neelix's family, were killed when the Haakonians attacked Rinax using a Metreon Cascade, a weapon creating a Metreon cloud that kills all life.
(Jetrel)

Hanon IV (Proto-Humanoids)
This seismic and volcanic active M class planet is inhabited by a tribal proto-humanoid species. The Kazon dumped the crew here after taking over ship. Naomi Wildman became ill but the leader of the tribe cured her with medicinal herbs and roots.
(Basics)

Hierarchy, The
Hostile

The hierarchy plants ships that attack alien ships passing through their area of space, destroy them and drain them of their resources. The Hierarchy must approve everything they do. They attack with different stealth methods to avoid detection.
(Tinker Tenor Doctor Spy, Renaissance Man)

Hirogen
Hostile

Voyager first encountered the Hirogen in 2374 after finding an array network that the Hirogen claimed was theirs. Voyager used the arrays as an amplifier to communicate with the Alpha Quadrant through a small wormhole leading into the Alpha Quadrant. The Hirogen is a hunting species with only one target: their prey. Once the Hirogen have chosen their prey, they hunt it down, kill it and display it, as a trophy. At one time, the Hirogen managed to disable Voyager and control it using the crew as prey in holodeck simulations. Captain Janeway and Seven and several other crewmembers were able to fight the Hirogen and Ensign Kim was able to overload the Holodeck. As a peace offer, Janeway donated the holodeck technology to the Hirogen. In year 2377 Voyager encountered the Hirogen again after they had abused the holodeck technology and created simulated characters that took over the simulation. Janeway felt responsible for the situation and helped correcting the mistake.
(Message in a Bottle, Hunters, Prey, The Killing Game, Tsunkatse, Flesh and Blood)

Ilarians
Peaceful

A species with a government divided into provinces.
(Warlord)

Ilidarian
Mostly Peaceful

A species known to Neelix who might be able to help rescue a ship trapped in a Quantum Singularity's event horizon.
(Parallax)

Jye
Peaceful

The Jye is well known for their administrative skills. The Dinaali employed them to administrate their medical care.
(Critical Care)

Kadi
Peaceful

Humanoids from a monastic colony with strict dietary protocols that prohibits spicy food or anything that will inflate their senses. They can only wash themselves in purified water and they go to eight daily services. The Kadi had minerals at their colony that Janeway wanted to initiate a trade agreement for.
(Someone to watch over me)

Kazon (Species 329)
Hostile

 
Voyager first encountered the Kazon after arriving in the Delta Quadrant in 2371. The Kazon is a very hostile, aggressive species, which exist in 18 separate sects (such as the Ogla and the Nistrim). Sometimes these sects work together, but most of the time they fight amongst one another. Many years ago, the Kazon were held captive and were suppressed by the Trabe. These events on Trabe worlds led to the aggressive nature of the Kazon. Eventually, the Kazon overthrew the Trabe, and took-over many of their planets and stole their ships. The Kazon sects have one purpose - to sustain themselves. Since water is scarce and they have very little technology, the Kazon were constantly looking for an opportunity to steal whatever technology Voyager had. Handing out technology to alien species would violate the prime directive, and could alter the balance of power in the Delta Quadrant, which is why Janeway refused to give it away. A Kazon soldier must prove himself in battle to receive a name. The Kazon are a male dominated society, driven to destroy weaker cultures. Women are merely prizes and possessions. Culluh is the First Maje of the Nistrim sect.
(Caretaker, State of Flux, Alliances, Investigations, Initiations, Basics)

Klingon
Once Hostile

Klingons are a proud, tradition-bound people that value honor and their military power is respected. Klingons have a militaristic society, thriving on conflict and they seek honor and glory in battle (go here to find out more) .
(Faces, Day of Honor, Barge of the Dead, Prophecy)

Kobali
Peaceful

The Kobali procreate by altering the DNA of the dead they salvage from other races. They find bodies drifting in space, reanimate them and give them a family structure in the Kobali society. Mostly, but not always, they forget about their previous lives. Ensign Lyndsay Ballard, had been dead for three years when she contacted Voyager.
(Ashes to Ashes)

Kohl
Peaceful

The Kohl homeworld was severly damaged by solar flares in 2353 and 400,000 inhabitants died as a result. The planet was slowly recovering its eco-system from the resulting ice age when Voyager picked up an automated message from the planet in 2372. One settlement had created a virtual environment in hibernation pods controlled by a computer programmed to keep them happy and wake them up once the planet was habitable again. The program manifested the worst fears of the inhabitants subconscious minds into the persona of the Clown who kept them prisoners to that fear.
(The Thaw)

Komar
Hostile

Sentient, trianic-based energy beings living in a dark-matter nebula, absorbing the neural energy of passing ship crews. They can occupy a humanoid body if they want but a magneton flash will make them leave.
(Cathexis)

Kradin
Hostile

The Vori are at war with the Kradin and to win the war the Vori abducts people, send them to simulations where they use mind-control techniques to make them hate the Kradin and get them to help them fight their war.
(Nemesis)

Krenim Imperium
Hostile

Voyager first learned of the Krenim from Kes when she saw a possible future timeline in episode before and after. She warned the crew of a dangerous species who used temporal mechanics as a weapon.
Voyager and the crew didn't actually encounter the Krenim until 2374. They soon learned that Krenim weapons were chroniton-based and existed in a state of temporal flux, which allowed their torpedoes to successfully penetrate deflector shields. This ship was first used to wipe out the Rilnar, who were the krenim Empire's worst enemy. But removing the Rilnar from history led to a devastating plague that almost destroyed the Krenim. The Krenim temporal time ship had tried to erase different species, like the Rilnar and the Zahl, from history for 200 years in hopes of restoring the Krenim Imperium back to its original state. In the end, the time ship was destroyed and the timeline was completely restored.
(Before and After, Year of Hell)

Kyrian
Relatively Peaceful

A species that blamed Voyager for a horrible civil war that nearly wiped out the Kyrian race. The crew were portraid in a museum as violent people who slaughtered millions of innocent people in order to use a wormhole leading to the Alpha Quadrant.
(Living Witness)

Ledosian
Peaceful

Voyager encountered the Ledosian when Chakotay and Seven got stranded on Ventu, A planet inhabited by primitive humanoids. The Ledosian wanted to evaluate the planet for development but the Ledosian ancestors had protected Ventu from being used by creating a force field around the planet.
(Natural Law)

Lokirrim
Relatively Peaceful

"Photonic insurgents" (or holograms) are forbidden in Lorrikim space. They use a disruption field to decompile holograms that pass through their space. Seven had to download the Doctor's program into her cybernetic implants or his matrix would have been destroyed.
(Body and Soul)

Malon
Ruthless

 
The Malon was first encountered in 2375 when a Malon freighter had contaminated a vast region of space with Theta radiation. They don't have the technology to recycle their anti-matter waste and have resorted to transport it out of Malon space and dump it at remote parts of the quadrant. They use highly paid anti-matter core workers and laborers to transport their lethal theta-radioactive cargo. Voyager has encountered the Malon at several occasions and they have proven to be quite ruthless.
(Night, Extreme Risk, Juggernaut)

Mari
Peaceful

The Mari is a telepathic species that has out-lawed violent thoughts to prevent crime. If a person commits or thinks about committing a violent act he or she is sentenced to undergo an engramatic purge to remove all violent memories. They have no prisons and the person is set free after the procedure.
Voyager first encountered the Mari in 2374 when the crew was allowed to beam down to the surface of the Mari home world for rest and relaxation. There is a black market of violent thoughts circulating the Mari Home world.
(Random Thoughts)

Mawasi
Peaceful

The Mawasi allied themselves with Voyager and the Nihydron to destroy the Krenim timeship responsible for repetedly altering the history in Krenim space.
(Year of Hell)

Mikhal
Peaceful

The Mikhal are space explorers who Voyager encountered in 2373 that helped Voyager map a route back to the Alpha Quadrant.
(Darkling)

Mokra
Hostile

The Mokra is a species that invaded and occupied the peaceful planet Alsauria along with its inhabitants. Torres and Tuvok were captured and sent to an impenetrable prison. The Alsurian resistance helped Janeway to free her crewmembers but the brutal Mokra regime was determined to crush the growing resistance movement.
(Resistance)

Monean
Peaceful

The Monean people live underwater, farming sea vegetation and extracting oxygen for their ships. An ancient field reactor controlled by a core computer regulates the planet. When the water started to loose containment, Paris decided to help them whether their officials wanted his help or not. He ended up being demoted to an ensign after refusing to obey orders.
(Thirty Days)