- Allen family2
- Allen, Robert C. (Robert Clotworthy), 1834-18631
- Almeida, Marília Sant'Anna de, 1948-1
- Alumni Band Organization.1
- Alwood, William Bradford, 1859-19461
- Amalgamated Association of Street and Electric Railway Employees of America, Division 1031
- Ambler, Charles Henry, 1876-19573
- American Association of University Women. Norfolk Branch1
- American Flint Glass Workers' Union1
- American Flint Glass Workers' Union, Local 10 (Moundsville, West Virginia)1
- American Institute of Architects1
- American Institute of Architects. Women in Architecture1
- American Political Items Collectors1
- American Public Transportation Association1
- Amherst, Jeffery Amherst, Baron, 1717-17971