Wilhelm Heinrich Westphal was a German physicist. From 1918, he was a professor at the University of Berlin. During the period 1922 to 1924, he was also an expert adviser to the Prussian Ministry of Science, Arts and Culture. From 1928, he was simultaneously a professor at the University of Berlin and at Technische Hochschule Berlin. His position at the former ended when it fell in the Russian sector at the close of World War II, but he achieved emeritus status at the latter in 1955.