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- U.S. Atomic Energy Commission.
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- U.S. Fish and Wildlife Service. Division of Ecological Services,
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- U.S. Fish and Wildlife Service. Division of Fish Hatcheries. Branch of Production and Distribution.
- U.S. Fish and Wildlife Service. Division of Fishery Research.
- U.S. Fish and Wildlife Service. Division of Hatcheries and Fishery Resource Management.
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- U.S. Fish And Wildlife Service. Division of Predator and Rodent Control.
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- U.S. Fish and Wildlife Service. Ecological Services (Denver, Colo.),
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- U.S. Fish and Wildlife Service. Missouri River Basin Studies.
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- U.S. Fish and Wildlife Service. Office of Biological Services.
- U.S. Fish and Wildlife Service. Office of Endangered Species.
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- U.S. Fish and Wildlife Service. Region 1.
- U.S. Fish and Wildlife Service. Region 4,
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- U.S. Fish and Wildlife Service. Region 7.
- U.S. Fish And Wildlife Service. Region 8.
- U.S. Lake Survey.
- U.S. Livestock Insects Laboratory.
- U.S. Nuclear Regulatory Commission. Division of Safeguards, Fuel Cycle, and Environmental Research.
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- U.S. Plant, Soil, and Nutrition Laboratory.
- U.S. Regional Pasture Research Laboratory.
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- Ugent, Donald, 1933-2011
- Uglem, Gary L
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- Ugolini, Alberto
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- Uğurlu, Zübeyde
- Uğurtaş, Ismail
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- Uhl, Charles Harrison, 1918-2010
- Uhl, Christopher
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- Uhlenhuth, Eduard, 1885-
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- Uieda, Virginia Sanches
- Uieda, Wilson
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- Ukraine. Ekonomicheskiĭ sovet.
- Ukraine. Narodniĭ komisarii͡at zemelʹnikh sprav.
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- Ukraine. Selʹskokhozi︠a︡ĭstvennyĭ nauchnyĭ komitet. Sekt︠s︡ii︠a︡ gruntoznavstva.
- Ukraine. Silʹsʹko-gospodarsʹkiĭ naukoviĭ komitet.
- Ukuwela, Kanishka
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- Ulenberg, Sandrine A.
- Ulevicius, Alius
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- Uline, Edwin Burton, 1867-1933
- Ulisses, Cláudia
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- Ulke, Henry
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- Ullathorne Seed Co.
- Ullenbruch, Klaus
- Ullepitsch, Josef