List of fictional alien species: B

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Name	Source	Type
Baalols	Perry Rhodan
Babel fish	The Hitchhiker's Guide to the Galaxy	A universal translator; a small yellow leech-like fish that telepathically translates all languages into one the wearer knows after inserting it in his ear.
Badoon	Marvel Comics
Bahmi	Rift: Planes of Telara	Descendants of humans and air spirits. Large blue- or violet-skinned humanoids.
Bailies	Cleopatra 2525	Machine race that conquered Earth
Bajoran	Star Trek	Humanoid
Ba'ku	Star Trek
Baliflids	Ascendancy
Ballchinnian	Men in Black II
Balmarian	Super Robot Wars
Baltan	Ultraman	Space ninja
Bane	The Sarah Jane Adventures	Large tentacled aliens
Bandersnatchi	Larry Niven's Known Space	Artificially engineered single-celled gastropod, twice the size of a brontosaurus. Slaver's meat animal, sentient. Agree to be hunted for sport in exchange for currency to purchase mechanical arms. Asexual reproduction, impervious to genetic degradation or mutation.
Bandi	Star Trek	Humanoid
Banik	Farscape	Humanoid
Bannermen	Doctor Who	Humanoid
Bantha	Star Wars	Huge hairy beasts of burden
Barkonides	Perry Rhodan
Barzans	Star Trek
Battle Cupcakes	Bravest Warriors	The Battle Cupcakes were engineered by Danny to fight to the complete and utter death.
Baufrin	Renegade Legion	Insectoid centauroid
Beings of the Extra Terrestrial origin which is Adversary of human race	Muv-Luv
Benjari	Battlelords of the 23rd Century
Benzite	Star Trek
Berellian	Star Trek
Berserkers	Fred Saberhagen's Berserker series
Berubelan	Anachronox
Besalisk	Star Wars	Four arms
Betazoid	Star Trek	Empathic humanoids
Bgztl	DC Comics Legion of Super-Heroes
Bioroids	Intense Stories
Bith	Star Wars
Bismollian	DC Comics' Legion of Super-Heroes
Bjorn	Space Quest
Black Arms	Shadow the Hedgehog	Humanoid
Black Cloud	Fred Hoyle	Interstellar dust cloud
Black Oil	The X-Files
Blastaar	Marvel Comics	Native of the Negative Zone
Blathereen	Doctor Who	Raxacoricofallapatorian
Blisk	Destroy All Humans! 2	Bipedal, armoured crustaceans with a hive mind and a dependence on radiation. Former natives of Mars.
Blobs	Invader Zim
Bolian	Star Trek	Blue-skinned humanoids
Boolite	Farscape	Humanoid
Borg	Star Trek	A race of cybernetically enhanced life forms from the Delta Quadrant of the Milky Way Galaxy. Able to assimilate almost any life form into their collective hive-mind and able to adapt to all forms of offensive capability instantly.
Bothans	Star Wars	Humanoid
Braalians	DC Comics' Legion of Super-Heroes
Bradicor	Schlock Mercenary
Brain Dogs	Bravest Warriors
Brainiac	Smallville
Brains	The Adventures of Jimmy Neutron: Boy Genius ("Win, Lose and Kaboom")
Brakiri	Babylon 5	Primarily night dwellers
Breen	Star Trek	Humanoid
Brelac	McKenzie Files	A reptilian alien race originating from Old Earth.
Bricker	Star Trek
Briori	Star Trek
Brood	Marvel Comics
Brunnen G	LEXX	Humanoid
Brunali	Star Trek
Brutes (Jiralhanae)	Halo	Pack mentality humanoids of great physical standing. Part of a larger group known as the "Covenant". Intensely loyal to their religious beliefs, intent on completely wiping out the human race.
Budong	Farscape
Bugs from Klendathu	Starship Troopers
Bulrathi	Master of Orion
Buggers	Ender's Game series	A hive mind species resembling insects. Invaded Earth twice before being destroyed at their home world by Andrew 'Ender' Wiggin.
Bunless People	Bravest Warriors	The Bunless people inhabit the planet Bunless 9 and have no buns.
Bynar	Star Trek