A

• Aqua alien
• Arachnid Alien
• Arachnoid

B

• Bellybursters
• Beluga-Xenomorph
• Berserker Alien
• Bodyburster
• Boiler
• Bull Alien

C

• Carrier
• Chestburster
• Chrysalis
• Crocodile Alien
• Crusher

D

• DarkAlien
• Defender
• Drone

E

• Egg-shaped Alien
• Electric aliens
• Empress

F

• Faceburster
• Facehugger
• Fire-Eater Alien

F cont.

• Flying Queen

G

• Genetic Xenomorph
• Giant FaceHugger
• Gorilla Alien

J

• Jockey-Xenomorph

K

• K-Series
• Killer Crab Alien
• Killer Croc Alien
• King Alien

L

• List of castes from the Alien expanded universe

M

• Mantis Alien

O

• Octo-Facehugger

P

• Panther and Night Cougar Alien
• Praetorian
• Praetorian Facehugger
• Predalien (caste)

Q

• Queen (caste)
• Queen Mother
• Genetic Queen

R

• Ravager
• Raven
• Razor Claws
• Red Army

R cont.

• Red Queen Mother
• Red Xenomorph
• Rhino Alien
• Rogue
• Royal Facehugger
• Runner

S

• Scorpion Alien
• Small winged alien head
• Smasher
• Snake Alien
• Spitter
• Stalker Alien
• Starry-faced alien
• Swarm Alien
• Swimming Alien

W

• Walled alien
• Warrior
• Wild Boar Alien

X

• Xenomorph (Alien)
• Xenomorph Egg
• Xenomorph Variants from Aliens RPG