Tatsuo Itoh (5 May 1940 — 4 March 2021) was an electrical engineer who was professor and holder of the Northrop Grumman Chair in Microwave and Millimeter Wave Electronics in the Electrical Engineering Department at the University of California, Los Angeles (UCLA), where he taught and conducted research on microwave and millimeter wave electronics, guided wave structures, low power wireless electronics, and integrated passive components and antennas.

He received the Doctor of Philosophy degree in Electrical Engineering from the University of Illinois at Urbana–Champaign in 1969.

[1] Itoh served as Editor-in-Chief of the IEEE Transactions on Microwave Theory and Techniques (1983–1985), and of the IEEE Microwave and Guided Wave Letters (1991–1994).

He served as President of the IEEE Microwave Theory and Techniques Society in 1990.

[2] Link to USPTO search for patents having inventor names "itoh" and "tatsuo" and an assignee name including the string "regent"