- Archer, Henry Waldegrave1
- Archer, John1
- Architects Collaborative1
- Architects Design Group8
- Architects and Engineers Affiliates1
- Architectural Iron Works (Firm)1
- Architectural League of New York3
- Ardale Building Corp.1
- Ardévol, José, 1911-19811
- Ardlan Construction Co., Inc.1
- Areda, Yousef Abou3
- Arel, Bülent, 1919-19905
- Arena, Franca, 1937-1
- Arena, Marc1
- Arende Building Corp.1
- Arends, Leslie C. (Leslie Cornelius), 1895-19851
- Argent Construction Corp.1
- Argerich, Martha, 1941-1
- Argot Construction Corp.1
- Argus Company1
- Argyros, Thomas G1
- Argüelles, José, 1939-20112
- Ariadne String Quartet1
- Arias, Consuelo, 1957-1
- Arista Realty Corp.1
- Aristophanes1
- Arizona State University3
- Arizpe S., Lourdes1
- Arkansas Black Hall of Fame1
- Arkansas Endowment for the Humanities1
- Arkansas gazette (Little Rock, Ark. : 1889)1
- Arkatov, Alan1
- Arkell Weekly Co.1
- Arlen, Alice, 1940-20161
- Arlen, Samuel S.1
- Arlington Terrace, Inc.3
- Arlinsky, Cindy1
- Arlow, Jacob A1
- Armand, Colonel1
- Armatrading, Joan1
- Armory Estates, Ltd.5
- Armour, M. Cochrane1
- Armstrong, Andrew, 1910-198317
- Armstrong, Barbara Nachtrieb, 1890-19762
- Armstrong, Donald1
- Armstrong, Florence, 1910-200417
- Armstrong, J. Sinclair (James Sinclair), 1915-20001
- Armstrong, Lorenzo D.1
- Armstrong, Margaret, 1867-19442
- Armstrong, Tom, 1932-20111
- Arnason, Edith1
- Arndt, Richard T., 1928-1
- Arner, Douglas G., 1926-20061
- Arner, Frederick B1
- Arnett, Loren E., 1925-20151
- Arnett, Peter, 1934-1
- Arnheim, Rudolf1
- Arnley Construction Co., Inc.1
- Arno Realty Corp.1
- Arnold M. Goldman Co.1