This is a list of lists of fictional extraterrestrial species.

Alphabetical

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z

By medium & franchise

Literature

• List of Noon Universe alien races

Comics

• List of alien races in DC Comics
• List of alien races in Marvel Comics

Film and television

• Species of the Marvel Cinematic Universe
• List of Star Wars creatures
• Lists of Star Wars species: A–E, F–J, K–O, P–T, U–Z
• List of Doctor Who universe creatures and aliens
• List of Star Trek aliens

Games

• Races of StarCraft
• Battlelords of the 23rd Century#Races

By appearance

• List of humanoid aliens
• List of reptilian humanoids