- American Association for the Advancement of Science - Open to any field of physical, biological or social sciences or any relevant interdisciplinary field.
- American Astronomical Society - Supports any type of astronomical research.
- American Chemical Society
American Foundation for Suicide Prevention - Supports research projects that help further the understanding and treatment of depression and the prevention of suicide.
Beckman Foundation - Supports non-profit research institutions to promote research in chemistry and the life sciences, broadly interpreted, and particularly to foster the invention of methods, instruments, and materials that will open up new avenues of research in science.
- The Camille & Henry Dreyfus Foundation - Funds research projects in chemistry, chemical engineering and related sciences.
Environmental Protection Agency
Earthwatch, The Center for Field Research - Supports field work worldwide in the following areas: endangered ecosystems, oceans, biodiversity, cultural diversity, folklore and oral history, global change, world health and archaeology.
Fred C. Gloeckner Foundation - The Foundation was organized as a non-profit, educational corporation in December 1960 by Frederick C. Gloeckner to provide a source of financial aid for research and educational projects in floriculture and the supporting and allied fields, such as plant pathology, plant breeding, agricultural engineering, agricultural economics, entomology, and plant physiology related to floriculture and ornamental horticulture.
- Hudson River Foundation - Seeks to elucidate the dynamic interactions between the physical, chemical and biological processes of the Hudson River. Prefers work that has a clearly articulated significance for identified policy issues, and that is conducted in the context of other ongoing research and monitoring of the river.
- Human Frontier Science Program - Supports basic research focused on complex mechanisms of living organisms; fields supported range from brain functions to biological functions at the molecular level. Particular emphasis is now placed on bringing scientists from fields such as physics, mathematics, chemistry, computer science and engineering together with biologists to open up new approaches to understanding complex biological systems.
- National Aeronautics and Space Administration - NASA encourages the submission of unsolicited proposals relevant to its mission.
- National Center for Environmental Research
- National Geographic Society - Supports scientific field research and exploration in the following disciplines: anthropology, archaeology, astronomy, biology, botany, geography, geology, oceanography, paleontology and zoology.
- National Institute of Mental Health
- National Institutes of Health
- National Research Council - Postdoctoral and senior research associateship awards are available for researchers in chemistry, earth and atmospheric sciences, engineering, mathematics and applied sciences, life and medical sciences, space and planetary sciences, and the physical sciences.
- National Science Foundation (homepage)
- National Science Foundation (grant proposal guide)
- National Science Foundation FastLane
- Naval Research Laboratory
- Office of Science and Technology (Embassy of France in the US) - (1) aides in strengthening the place of French science and technology in the United States, and (2) disseminates in France information on American research and development policy as well as current events in science and technology
- Research Corporation - Supports research in astronomy, chemistry and physics.
- Alfred P. Sloan Foundation - Supports research in chemistry, physics, mathematics, economics, neuroscience and computer science.
- U.S. Air Force Office of Scientific Research
- U.S. Department of Agriculture
- U.S. Department of Agriculture Cooperative State Research, Education and Extension Program
- U.S. Department of Energy
- U.S. Department of Health and Human Services
- Whitehall Foundation - A not-for-profit foundation which is focused exclusively on assisting basic research in vertebrate (excluding clinical) and invertebrate neurobiology in the United States. Investigations should specifically concern neural mechanisms involved in sensory, motor, and other complex functions of the whole organism as these relate to behavior. The overall goal should be to better understand behavioral output or brain mechanisms of behavior.