It may also refer to:
Ego, one of the three constructs in Sigmund Freud's structural model of the psyche
Ego (spirituality), the "self", "self-concept", "false self", "conceptual identity", or identification with individual existence
Ego (religion), as defined in various religions in relationship to self, soul etc
Ego the Living Planet, a character in the Marvel Universe
Planet Eclipse Ego, a paintball marker produced by Planet Eclipse
In discussions of kinship systems, the person through which the relationship is traced
Ego (fish), a genus of gobies in subfamily Gobiinae