Louis Warren Ross (July 18, 1893 – September 8, 1966) was an American architect from Boston, Massachusetts, perhaps best known for his work at the University of Massachusetts Amherst, where he designed over thirty of the campus buildings there. Ross graduated in 1917, entering the army soon after. He would serve as an infantry lieutenant in the 166th Regiment of the 42nd Infantry Division, better known as the "Rainbow Division", in France during the First World War. By the end of the war he had been awarded a Purple Heart with an oak leaf cluster.