A
- A-bike - UK
- Abici - Italy
- Accell - Dutch, owns Hercules, Staiger, Winora, Tunturi, Lapierre Mercier, Atala, Batavus, Loekie, Koga-Miyata, and Sparta B.V.
- Adler - Germany (defunct)
- AIST - Belarus
- ALAN - Italy
- Alcyon - France (defunct)
- Alldays & Onions - UK (defunct)
- American Bicycle Company - USA (defunct)
- American Machine and Foundry (widely known as AMF) - USA (defunct), formerly owned Roadmaster.
- American Star Bicycle - USA (defunct) manufactured by the H. B. Smith Machine Company
- Argon 18 - Canada
- Ariel - England (defunct)
- Atala - Italy
- Author - Czech Republic
- Avanti - New Zealand
Read more about this topic: List Of Bicycle Brands And Manufacturing Companies