- Abbot, E. T. (Civil engineer)1
- Abbott, E. T. (Edward T.), 1847-19381
- Abert, J. W. (James William), 1820-18971
- AcadeĢmie royale des sciences (France)1
- Ackermann and Co.1
- Adams, Henry, Captain1
- Adept Map Co.1
- Akerson, E. A1
- Akrel, Fredrik,1748-18041
- Albergaria, Lopo Soares de, approximately 1453-approximately 15321
- Albers, Paul1
- Albin, John, active 1791-18001
- Alden, William C. (William Clinton), 1871-19591
- Alexander, Scott C.1
- Allard, Carel, 1648-approximately 17091
- Allen, Charles Julius,1840-19151
- Allen, George (Engraver)1
- Allen, James, 1806-18461
- Allen, R. C. (Rolland Craten), 1881-19481
- American Automobile Association1