In philosophy|lang=en terms the difference between utilitarianism and populism
is that
utilitarianism is (philosophy) the theory that action should be directed toward achieving the "greatest happiness for the greatest number of people"; hedonistic universalism while
populism is (philosophy) a political doctrine or philosophy that proposes that the rights and powers of ordinary people are exploited by a privileged elite, and supports their struggle to overcome this.
As nouns the difference between utilitarianism and populism
is that
utilitarianism is (philosophy) a system of ethics based on the premise that something's value may be measured by its usefulness while
populism is (philosophy) a political doctrine or philosophy that proposes that the rights and powers of ordinary people are exploited by a privileged elite, and supports their struggle to overcome this.