Melville Eastham (June 26, 1885 – May 6, 1964) was a noted American radio pioneer and business executive.
After noticing that the high-voltage spark coils used to excite X-ray tubes were becoming popular as transmitters for radio amateurs, he joined two other employees in 1906 to start the Clapp, Eddy, and Eastham Company (subsequently Clapp-Eastham) in Boston, to sell spark coils, variable capacitors, and other radio devices.
During World War II, Eastham led the LORAN radio navigation development efforts at MIT's Radiation Laboratory.
He stepped down as president of General Radio in 1944 but retained the title of chief engineer until his retirement in 1950.
He received the IRE Medal of Honor in 1937 "for his pioneer work in the field of radio measurements, his constructive influence on laboratory practice in communication engineering, and his unfailing support of the aims and ideals of the Institute."