Philip J. Higgins (born 1926, died March 25, 2015) was a British mathematician, who worked in areas of algebra and algebraic topology. He is well known for his book

Philip J. Higgins, Categories and Groupoids, Mathematical Studies 32, van Nostrand New York (1971), Reprints in Theory and Applications of Categories 7 (2005) 1-195 [tac:tr7, pdf]