Timothy David Noakes is a South African scientist, and an emeritus professor in the Division of Exercise Science and Sports Medicine at the University of Cape Town. He is also a member of the National Research Foundation, who list him as one of their highest-rated members.

He has run more than 70 marathons and ultramarathons, and is the author of several books on exercise and diet. He is known for his work in sports science and for his support of a low-carbohydrate, high-fat (LCHF) diet, as set out in his books The Real Meal Revolution and Lore of Nutrition: Challenging Conventional Dietary Beliefs.