Narcissism is the personality trait of egotism, vanity, conceit, or simple selfishness. Applied to a social group, it is sometimes used to denote elitism or an indifference to the plight of others.

The name "narcissism" is derived from Greek mythology. Narcissus was a handsome Greek youth who had never seen his reflection, but because of a prediction by an Oracle, looked in a pool of water and saw his reflection for the first time. The nymph Echo--who had been punished by Hera for gossiping and cursed to forever have the last word—had seen Narcissus walking through the forest and wanted to talk to him, but, because of her curse, she wasn't able to speak first. As Narcissus was walking along, he got thirsty and stopped to take a drink; it was then he saw his reflection for the first time, and, not knowing any better, started talking to it. Echo, who had been following him, then started repeating the last thing he said back. Not knowing about reflections, Narcissus thought his reflection was speaking to him. Unable to consummate his love, Narcissus pined away at the pool and changed into the flower that bears his name, the narcissus.

Freud believed that some narcissism is an essential part of all of us from birth. Andrew P. Morrison claims that, in adults, a reasonable amount of healthy narcissism allows the individual's perception of his needs to be balanced in relation to others.