Jimmy K. Omura (born September 8, 1940 in San Jose, California) is an electrical engineer and information theorist. Omura received his B.S. and M.S. from MIT, and his Ph.D. from Stanford University, all in electrical engineering. He was a professor of electrical engineering at UCLA for 15 years. His notable work includes the design of a number of spread spectrum communications systems, and the Massey-Omura cryptosystem (with James Massey). With Andrew Viterbi he co-authored Principles of Digital Communication and Coding (ISBN 0070675163), a standard textbook in digital communications. He also co-authored the Spread Spectrum Communications Handbook (ISBN 0071382151).