Francis Wheeler Loomis (August 4, 1889 – February 9, 1976), born in Parkersburg, West Virginia, was an American scientist most widely known for his contributions in the field of physics.

When approached by Loomis to join his staff, Isidor Isaac Rabi stated bluntly "I love subways and I hate cows.

[6] Loomis was elected president of the American Physical Society and a member of the National Academy of Sciences in 1949.

[2] In World War I, Loomis served at the Aberdeen proving ground, where he was an Army Ordnance captain.

[7] Loomis founded the Control Systems Laboratory as a research center for national defense purposes during the Korean War.