- A-ROSA Flussschiff
- Aava Lines
- Acciona Trasmediterránea
- Ace Link
- Adler-Schiffe
- Adora Cruises
- Adria Ferries
- Aegean Speed Lines
- Africa Morocco Link
- AIDA Cruises
- Akgünler Denizcilik
- Albatros Expedition
- Algerie Ferries
- Alilauro
- AlsFærgen
- Alslinjen
- Ambassador Cruise Line
- ANEK Lines
- AnRussTrans
- Arab Bridge Maritime
- Armas
- ASDP Indonesian Ferry
- Atlantic Steam Navigation Company
- Atlânticoline
- Azamara Cruises