Max Bernhard Weinstein (1 September 1852 in Kaunas, Vilna Governorate – 25 March 1918) was a German physicist and philosopher. He is best known as an opponent of Albert Einstein's Theory of Relativity, and for having written a broad examination of various theological theories, including extensive discussion of pandeism. Born into a Jewish family in Kovno (then Imperial Russia), Weinstein translated James Clerk Maxwell's Treatise on Electricity and Magnetism into German in 1883, and taught courses on electrodynamics at the University of Berlin.