Denis A. Higgs (6 May 1932 – February 25, 2011) was a British mathematician, Doctor of Mathematics, and professor of mathematics who specialised in combinatorics, universal algebra, and category theory. He wrote one of the most influential papers in category theory entitled A category approach to boolean valued set theory, which introduced many students to topos theory.He was a member of the National Committee of Liberation and was an outspoken critic against the apartheid in South Africa.