- Anvil Island
- Appleby Island
- Arakun Islands
- Archibald Islands
- Arden Islet
- Ardmore
- Argyle Islet
- Arichika Island
- Aristazabal Island
- Arm Islands
- Armstrong
- Arnold
- Arriaga Islands
- Arthur Island
- Arthur Island
- Ashcroft
- Ashdown Island
- Assits Island
- Atchelitz
- Atchison Island
- Athabaskan Island
- Athlone Island
- Atkinson Island
- Austin Heights
- Austin Island
- Avery Island
- Ayton Island
- Azimuth Island