Yew-Kwang Ng (born 7 August 1942) is a Malaysian economist. He is currently Special Chair Professor at Fudan University and Emeritus Professor at Monash University, and sits on the Board of Advisors of the Global Priorities Institute.

Ng's contributions to welfare biology,^[1][2][3] welfare economics,^[4][5] population ethics,^[6] the ethics of existential risk,^[7][8][9] the measurement of wellbeing,^[10] and the rehabilitation of utilitarianism^[11][12][13] make him a figure of central importance in the history of effective altruism.

Ng's welfare economics textbook is dedicated to "the welfare of all sentients."^[14] His latest book is Happiness—Concept, Measurement and Promotion.^[15]