A
- A&M Records – Herb Alpert and Jerry Moss
- A&W Restaurants – after Roy Allen and Frank Wright
- Abbott Laboratories – Wallace Calvin Abbott (1888)
- Abercrombie & Fitch – David T. Abercrombie and Ezra Fitch
- Abrams Air Craft – Talbert Abrams
- Abt Sportsline – Johann Abt
- Adam Opel AG – Adam Opel
- Adidas – Adi Dassler
- A. G. Edwards – Albert Gallatin Edwards
- Agusta – Giovanni Agusta
- AGV – Gino Amisano (Amisano Gino Valenza)
- Aitken Spence– after Patrick Gordon Spence, Edward Aitken and S.R. Aitken
- Ajo Motorsport – Aki Ajo
- Albert Heijn and Ahold (Albert Heijn Holdings) – Albert Heijn
- Aldi – Theo and Karl Albrecht (ALbrecht DIscount)
- Alessi – Giovanni Alessi
- Alex von Falkenhausen Motorenbau – Alex von Falkenhausen
- Alza – ALex ZAffaroni.
- AMG – Hans Werner Aufrecht and Erhard Melcher (Aufrecht Melcher Großaspach)
- Amon – Chris Amon
- Amstrad – Alan Sugar (Alan Michael Sugar Trading)
- Anatra – Artur Antonovich Anatra
- Andrea Moda Formula – Andrea Sassetti
- Anheuser-Busch – Lilly and Eberhard Anheuser, and Adolphus Busch
- Ann Summers – Annice Summers, secretary of founder Caborn Waterfield
- Ansaldo – Giovanni Ansaldo
- The Anschutz Corporation – Philip Anschutz
- Antonov – Oleg Antonov
- Arai Helmet – Hirotake Arai
- Archer Daniels – George A. Archer and John W. Daniels
- Armani – Giorgio Armani
- Arrows – Franco Ambrosio, Alan Rees, Jackie Oliver, Dave Wass, and Tony Southgate
- ARTA – Aguri Suzuki (Autobacs Racing Team Aguri)
- Arzani-Volpini – Egidio Arzani and Gianpaolo Volpini
- AS Watson – Alexander Skirving Watson
- Aston Butterworth – Bill Aston and Archie Butterworth
- Aston Martin – Lionel Martin
- Audi – August Horch (audi is Latin for horch which means listen in English)
- Avery Dennison Corporation – R. Stanton Avery
- AviaBellanca Aircraft – Giuseppe Mario Bellanca
Read more about this topic: List Of Companies Named After People