- AEP Industries Inc.
- Aer Arann
- Aer Lingus
- Aeroflex Inc
- Aeroflot
- Aeromexico
- Aeropostale Inc
- Aerosmith (band)
- AES Corporation
- Aesculapius Remedies
- AEterna Zentaris, Inc.
- Aetna Inc.
- AFC
- AFC Ajax
- AFC Bournemouth
- AFC Enterprises, Inc.
- Affiliated Computer Services, Inc.
- Affiliated Managers Group, Inc.
- Affinia Group Intermediate Holdings
- Affymetrix, Inc.
- Afghan Whigs (musician)
- AFI (musician)
- AFL-CIO
- AFLAC
- Africa Development Bank
- Africa Israel Investments
- African National Congress
- African Union
- Afrissippi (musician)
- Aftek
- Aftermath Entertainment
- Afterschool Alliance
- Aftonbladet
- Against Me! (musician)
- Aganovich
- Agarwal Holdings
- Agatha (designer)
- AGC Networks
- AGCO
- Ageas
- Agee Gold Refiners
- Agencia de Noticias dos Direitos da Infancia
- Agent Provocateur (designer)
- Agenzia Giornalistica Italia
- Agere Systems Inc
- Agetec
- Aggreko
- Agile Software Corporation
- Agilent Technologies, Inc.
- Agilysys, Inc.
- Agio Paper & Industries
- AGL Resources, Inc.
- Agnes Scott College
- Agri Marine Exports
- Agricultural Bank of China
- Agriculture Insurance Co. of India Ltd.
- Agrimas Chemicals
- Agriprocessors Inc
- Agritech Hatcheries and Foods
- Agrium Inc.
- Agro Chem Punjab
- Agro Dutch Industries
- Agro Tech Foods
- Agua Caliente Casino Resort Spa
- AgustaWestland
- AHALife
- Ahlcon Parenteral (India)
- Ahleuchatistas (musician)
- Ahlu Sunna Wal Jamaa
- Ahluwalia Contracts India
- Ahmedabad Advance Mills
- Ahmedabad Gases
- Ahmedabad Steelcraft
- Ahmednagar Forgings
- Ahn Jung-Hwan
- Ahn Trio
- Ahold
- Ahura Welding Elec Mfg
- AI Champdany Industries
- AIA Engineering
- AIFF XI
- AIG Global Investment Group MF
- AIGA
- AIK Fotboll
- Ailey II
- Aimco Pesticides
- Air Arabia
- Air Asia
- Air Berlin
- Air Canada