Moral psychology is a field of study at the intersection of philosophy and psychology. It  covers areas such as reasoning, moral development, moral motivation, and the evolutionary origins of morality.

Effective altruists have taken a special interest in several topics moral psychology, including the psychology of effective giving;^{[1][2][3][4][5][6][7]} the psychology of existential risk;^[8] the psychology of population ethics;^[9]  the psychology of the future;^[10] the psychology of speciesism;^[11][12][13] the psychology of utilitarianism;^[14][15] the link between giving and happiness;^[16][17] the personality traits of effective altruists;^[18] and the psychology of altruistic motivation.^[19]