- Abraham Anson papers, 1939/200525
- Agnes Wolf papers, 1966/200611
- Alan Bowne papers, 1964/1991, bulk 1980/19895
- Alexander Haight family collection, 1764/19763
- American Political Items Collectors collection9
- American Public Transportation Association records, 1898/1999262
- American Theatre Association records76
- Amy Federman performing arts collection, 1963/20121
- Arden B. Schell Watergate collection760
- Arena Stage records, 1949/2010515
- Armistead L. Boothe collection, 1920/19836
- Arnold Sundgaard papers, 1925/198884
- Arthur Arundel papers, 1964/19904
- Arthur E. Scott photograph collection31
- Arthur Franklin Raper papers, 1959/19755