Diogenes James Angelakos (July 3, 1919 – June 7, 1997) was an American electrical engineer and professor emeritus of electronic engineering at the University of California, Berkeley, who served as the director of the Electronics Research Laboratory for 20 years. He is credited with building up the research group into one of the university's biggest research labs. He is considered a pioneer in the field of microwaves, antennas and electromagnetic waves.