Sir William David Ross KBE FBA (; 15 April 1877 – 5 May 1971), known as David Ross but usually cited as W. D. Ross, was a Scottish philosopher who is known for his work in ethics. His best-known work is The Right and the Good (1930), and he is perhaps best known for developing a pluralist, deontological form of intuitionist ethics in response to G.E. Moore's intuitionism. Ross also , in addition to writing on Greek philosophy.