Encyclopedias, Almanacs, Transcripts, and Maps
- Administration, Military
- Administrative Dispute Resolution Act (1990)
- Administrative Procedure Act (1946)
- Admirals, Rank of
- Adolf Augustus Berle Jr
- Adolfo Ruiz Cortines
- Adolph Coors
- Adolph Simon Ochs
- Adolphe Felix Sylvestre Eboué
- Adolphus Egerton Ryerson
- Adorno, Theodor (1903–1969)
- Adriano Olivetti
- Adrianople
- Adventure and Invention: An Era of Daring
- Advertising Industry
- Advertising Restrictions
- Advice and Etiquette Books
- Adyge
- Adzhubei, Alexei Ivanovich
- Aelbert Cuyp