A
- Abney Hall - Stockport
- Abney Park Cemetery
- Ackroyd Drive
- Acomb Wood - York
- Acornfield Plantation
- Adelaide Camden, London
- Afton Marshes
- Ainsdale and Birkdale Hills – Sefton, Merseyside
- Ainslie Wood
- Alcott Wood – Solihull, West Midlands
- Alder Hills
- Alder Moors
- Alderman Canal East
- Alderman Canal West
- Alexandrina Plantation – Broxtowe, Notts
- Ali's Pond
- Alkincoats Woodland
- Alkrington Woods – Rochdale
- Allensford Woods – Derwentside, Co Durham
- Aller Brook
- Allestree Park - Derby
- Alney Island
- Alverstone Mead
- Alverthorpe and Wrenthorpe Meadows – Wakefield, West Yorks
- Ambarrow Court
- Amble Dunes
- Ambley Wood
- Anglers Country Park – Wakefield, West Yorks
- Ankerdine Common
- Annitsford Pond
- Anston Stones Wood
- Anton Lakes
- Ardingly Reservoir
- Arger Fen
- Arlington Reservoir
- Arthur Jacob Nature Reserve
- Ash Priors Common
- Ashford Green Corridor
- Ashlawn Cutting
- Ashtead Park
- Askers Meadow
- Aspall Close
- Astonfields Balancing Lakes – Stafford
- Atkinson's Warren – North Lincolnshire
- Avon Valley Reserve
- Avon Valley Woodland
- Axholme Line - Haxey – North Lincolnshire
- Aylestone Meadows - Leicester
Read more about this topic: List Of Local Nature Reserves In England