Races

Races in Mass Effect can be quite varied. While human is the only playable race, there are plenty of alien races that are enemies or NPCs.

Citadel Races

 * Asari
 * Batarians
 * Elcor
 * Hanar
 * Humans
 * Keepers
 * Salarians
 * Turians
 * Volus

Non-Citadel Races

 * Collectors
 * Geth
 * Krogan
 * Quarians
 * Reapers

Extinct races

 * Protheans
 * Rachni
 * Zeioph (background only)

Non-Sentient creatures

 * Husks
 * Thresher Maws
 * Varren

Other creatures

 * Gas Bags
 * Pod Crabs
 * Space Monkeys
 * Shifty Looking Cow
 * Giant Beetles
 * Unknown Creature
 * Nathak (mentioned only)
 * Thorian