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- Abbott, Joy & Ade
- Aboud, Edward
- Aboud, Elias
- Abreu, Ramon
- Achievement Rewards for College Scientists (ARCS)
- Actors Theatre of Phoenix
- Adams, David Anderson
- Adams, David Edward
- Adjutant General Ledgers
- Adobe Corral
- African American History Internship Project
- Aguiar, Don Jesus Jose
- Aguirre Family
- AHS Membership Notice
- AHS-Ephemera Collection (Tempe)
- Aitken, Kenneth
- Akin, Wayne
- Akins, Albert
- Aldrich, Mark
- Alexander, Scott
- Aley, Frank
- Alianza Hispano-Americana
- Alkire, Frank
- Allen, Helen Hamlin
- Allen, Katherine
- Allison Family
- Alpha Delta Kappa
- Altshuler, Constance
- Alverson, Leonard
- American Association of University Women
- Amigas de Amor Women’s Club
- Amos, George
- Ancient Order of United Workmen
- Anderson, C. O.
- Anderson, John B.
- Anderson, John W.
- Andrews, Julius
- Apache Buick Motor Co.
- Apache Raid Statistics
- Appel, Nathan
- Applewhite-Douglas Collection
- Architectural Drawing Collection
- Arizona Bankers Association
- Arizona Bicentennial Commission
- Arizona Building Company
- Arizona Cattle Growers
- Arizona’s Children Association
- Arizona Coaches Association
- Arizona Federation of Women’s Clubs
- Arizona Healthcare Federation
- Arizona Historical Foundation Mining Records
- Arizona Historical Foundation Oral Histories
- Arizona Improvement Company
- Arizona Legislature Apache Reports
- Arizona Livestock Sanitary Board
- Arizona Lumber & Timber Company
- Arizona Meat Company
- Arizona Medical Association
- Arizona Menu Collection
- Arizona Mining Claim Records
- Arizona National Guard
- Arizona Opera League of Tucson
- Arizona Parent Teacher Association
- Arizona Poultry Association
- Arizona Public Health Association
- Arizona Quarter Commission
- Arizona Quilt Project
- Arizona Rangers
- Arizona Republic Printing Office
- Arizona Society of Certified Public Accountants
- Arizona Southern Railroad
- Arizona State Cowbelles
- Arizona State Fair
- Arizona State Genealogical Society
- Arizona State Nurses Association
- Arizona Supreme Court
- Arizona Tax Research Association
- Arizona Tourism
- Arizona Trapshooting Association
- Arizona Women’s Christian Temperance Union Records
- Arizona Women’s Hall of Fame
- Arizona Wonder Circuit Tours
- Arizona Wool Growers
- Arkills, Mabel
- Armory Park Neighborhood Association
- Arnold, Elliott
- Ashman, Alfred
- Ashurst, Henry F. (Flagstaff)
- Ashurst, Henry Fountain
- Athletic Mine Company
- Auslander, Edith Sayre
- Ayer, Edward
- Ayers, James E
