- Alice San Diego
- Alico, Inc.
- Alicorp
- Alien Ant Farm (musician)
- Alima (designer)
- Alinea
- Alinghi
- Alison Krauss & Union Station
- Alitalia
- Alka Diamond Industries
- Alka India
- Alka Securities
- Alkali Metals
- Alkermes, Inc.
- Alkyl Amines Chemicals
- All Black
- All India Congress Committee
- All India Football Federation
- All India Forward Bloc
- All India Forward Bloc (Ramayan Singh)
- All India Forward Bloc (Ruikar)
- All India Forward Bloc (Subhasist)
- All India Institute of Medical Sciences
- All India Jharkhand Party
- All India Mazdoor Ekta Party
- All India Minorities Front
- All India Muslim Forum
- All India Progressive Janata Dal
- All India Tennis Federation
- All India Trinamool Congress
- All Jharkhand Students Union
- All Metro Health Care
- All Nippon Airways
- All Saints (musician)
- All Saints Episcopal Church
- Alla (musician)
- Allahabad Bank
- Allcargo Global
- Alldressedup
- Allegheny College
- Allegheny Energy, Inc.
- Allegheny General Hospital
- Allegheny Technologies
- Allegiant Air
- Allegiant Travel
- Allegri (designer)
- Allen Health Care
- Allen ISD
- Allergan, Inc.
- Allete, Inc.
- Alliance & Leicester
- Alliance Academy
- Alliance California Municipal Income Fund Inc
- Alliance Capital and Financial Services
- Alliance Credit Investments
- Alliance Data Systems
- Alliance Defense Fund
- Alliance for the Arts
- Alliance for Worker Freedom
- Alliance Funds Management
- Alliance of Small Island States
- Alliance One International, Inc.
- Alliance to Protect Nantucket Sound
- Alliance Trust
- Alliant Energy Corporation
- Alliant Techsystems Inc.
- Allied Computers International (Asia)
- Allied Digital Services
- Allied Irish Banks, p.l.c.
- Allied Nevada Gold Corp.
- Allied Partners
- Allied Resins and Chemicals
- Allied Waste Industries, Inc.
- Allion Healthcare, Inc.
- Allman Brothers Band
- Alloy Entertainment
- ALLSEC Technologies
- Allsoft Corporation
- Allstate
- Alltel
- Allude
- Allude (designer)
- Alluminio
- Allure Magazine
- Ally Capellino
- Alma College
- Almería
- Almondz Capital and Management Services
- Almondz Global Securities
- Almost Famous (designer)