William S. Hatcher (1935–2005) was an American mathematician, philosopher, educator and a member of the Baháʼí Faith.
A specialist in the philosophical alloying of science and religion, for over thirty years he held university positions in North America, Europe, and Russia.
He was born in Charlotte, North Carolina, United States on 20 September 1935, and died on 27 November 2005.
Hatcher is one of eight Platonist philosophers listed for the second half of the twentieth century in the Encyclopedie Philosophique Universelle.
Hatcher was the author of over fifty monographs, books, and articles in the mathematical sciences, logic and philosophy.