- Atlantic Paint Co.1
- Atlantic Screw Works1
- Atlantic Towers, Inc.3
- Atlas Terminals, Inc.1
- Atlas and Son1
- Atlas, Sol G.13
- Atlee, William T.1
- Atran Foundation (New York, N.Y.)1
- Attando, Joe2
- Attsino, Hank1
- Attwood, Simone1
- Attwood, William, 1919-19892
- Atwood & Rublee1
- Atwood, Charles B. (Charles Bowler), 1849-189523
- Aub, Joseph C. (Joseph Charles), 1890-19731
- Aubé, Jean-Paul 1837-19161
- Auchincloss, Louis1
- Auchter, Norma Holmes, 1922-1
- Audin, Lindsay11
- Auer, Felix1
- Auer, James1
- Auerbach, Jerold1
- Auerbach, Jerold S5
- Aufrichtig, Michael1
- Aug. Steffen1
- Augenbraum, Audrey2
- Augenstein, Leroy G. (Leroy George), 1928-19691
- August F. Richter1
- Augustus Pollack1
- Ault, Allie Burchenal1
- Ault, James1
- Aurand, Evan P., 1917-19891
- Aurand, Henry S., 1894-19801
- Aurelio, Richard, 1929-1
- Ausborn, James1
- Ausborn, Mrs.1
- Auslander, Joseph, 1897-19652
- Austen, Jane, 1775-18171
- Austerlitz, Robert, 1923-19941
- Austin Building Corp.1
- Austin Gardens Realty Corp.1
- Austin Management Corp.1
- Austin, Gerard1
- Austin, John Loring1
- Austin, Lodius M1
- Austin, Nichols & Co.7
- Austin, Warren Robinson, 1877-19623
- Australian Broadcasting Commission1
- Australian Institute of Sociology1
- Austria, Lucille, 1976-1
- Auten, Philip L1
- Autio, Rudy, 1926-20071
- Automatic Vaudville Parlor1
- Autrey, Herman, 1904-19801
- Autry, Gene, 1907-19981
- Avalon Terrace, Inc.1
- Avecrest Realty Co., Inc.1
- Avenue A Apartments Inc.1
- Avenue Associates7
- Avenue Hotel1