Objective Altruism is arguably the quintessential moral trait, involving willingness to benefit others and unwillingness to harm them. In this study, I explored how altruism and other personality variables relate to acceptance of euthanasia. In addition, I investigated the role of culture in attitudes to subcategorical distinctions of euthanasia.

Methods 190 Iranian students completed the Attitude Towards Euthanasia scale, the HEXACO Personality Inventory-Revised, and an interest in religion measure.

Results Higher scores on altruism, Honesty–Humility, Agreeableness, Conscientiousness and religiousness were associated with viewing euthanasia as unacceptable. As expected, altruism explained unique variance in euthanasia attitude beyond gender, religiosity and broad personality factors.

Conclusions Cultural and individual differences should be taken into consideration in moral psychology research and end-of-life decision-making.