Organizations
- AC Cars, a British specialist automobile manufacturer
- AC – The Danish Confederation of Professional Associations, an umbrella organisation for several Danish trade unions
- AC Transit, a regional public transit agency in the San Francisco Bay Area
- Action Congress, a political party in Nigeria
- Ad Council Japan (AC Japan), an organization that distributes Japanese public service announcements
- Air Canada (IATA code), an airline company
- Alternative for Change (Alternativa por el Cambio), a political party in Nicaragua
- Associated Content, an online publisher and distributor of original content
- Australia Council
- Ayala Corporation (Philippine Stock Exchange symbol), a holding company
- Civic Alliance Foundation (Alianţa Civică), a Romanian non-governmental organization
- Coast Alliance (Alianza Costeña), a former regional political coalition in Nicaragua
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