Grants.gov
From homepage "...your source to FIND and APPLY for federal government grants"Catalog of Federal Domestic Assistance
A wide variety of domestic-related grant and information sites.USA.gov
Search engine for Federal and State agencies in the United States.Grant Writing Tips
Sites collected by Afterschool.gov on grant writing.
Arts
National Endowment for the ArtsNational Endowment for the Humanities
Broad range of topics
Business
Small Business Administration Grants
Comprehensive list of federal grant sources for small businessesDepartment of Commerce
Included international and National Institute of Science and Technology opportunitiesDepartment of Labor and Employment and Training Administration
Grants support training and improvement of America's workforceEnergy Innovation Grants (California small businesses)
National Telecommunications and Information Administration
To support communication industries and the public
Crime
National Criminal Justice Grants
Education (Students, Schools and Libraries)
Cal Grants (California)
For California studentsStudent Aid on the Web see also Federal Pell Grants
e-GRANTS
The Department of Education's (ED) portal site for electronic grantsGrants & Contracts
Broader scope than the e-grants link.Institute for Museums and Library Services
Learning Technologies Project (NASA)
Wide variety of grants for educational purposesNational Endowment for the Humanities
Broad range of topics, but some are specifically for educational programsNuclear Regulatory Commission
For both students and institutions
Health
Office of Extramural Research (National Institute of Health)GrantsNet (Health and Human Services)
History
National Parks Service
History and
Housing
Natural Resources and Environment
Fish and Wildlife Service
Lists a variety of granting agencies involved with FWS concernsEnvironmental Protection Agency
National Oceanic and Atmospheric Agency
Research
Department of Justice
Funds research as well as law enforcement activitiesNational Center for Environmental Research (STAR Grants)
National Historical Publications and Records Commission (NHPRC)
Presidential Library Grants
Apply for grants to study in our nation's archival, science and other research collections.
Listing of private foundations associated with the Presidential Libraries which provide grants
Women's Issues
Office on Violence Against Women (DOJ)
Funds grants to provide aid and protection to victims of violence