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- Cadbury Hill
- Calshot Marshes
- Camerton Batch
- Camley Street Nature Park
- Canley Ford Community Woodland
- Cannon Hill Common
- Canvey Lake
- Captain's Wood
- Carlisle Park
- Carlton Marsh
- Carpenter's Wood, Dungrove Hill
- Carr Wood – Stockport
- Carr Wood, Derbyshire – Amber Valley, Derbyshire
- Carrs Woodland
- Castle Clough and Cowbury Dale – Tameside, Greater Manchester
- Castle Eden Walkway – Cleveland
- Castle Hill, Kingston – Kingston upon Thames
- Castle Hill, Newhaven – Lewes
- Castle Island, Wansbeck - Wansbeck, Northumberland
- Castlefields Wood
- Catcliffe Flash
- Catherington Down
- Catherington Lith
- Cecilly Brook – Staffordshire Moorlands
- Centenary Fields
- Chaddesden Wood - Derby
- Chadkirk Country Estate - Stockport
- Chailey Common
- Chairborough Road
- Chapman's Well – Durham
- Chard Reservoir
- Charlton's Pond – Stockton-on-Tees
- Charterfields, Kingswinford
- Charwell Wetlands, Bradninch
- Cheddar Valley Railway Walk
- Chellaston Brickworks – Derby
- Chelmer Valley Riverside
- Cherry Orchard, Worcester – Worcester
- Cherry Wood
- Chertsey Meads
- Chesham Woods
- Chessel Bay
- Chevet Branch Line
- Chevin Forest Park
- Chigwell Row Wood
- Children's Wood/Riverside Park
- Childwall Woods and Fields - Liverpool
- Chilswell Valley
- Chineham Woods
- Chiswick Eyot
- Choppington Community Woods
- Chorleywood Common
- Chorlton Ees and Ivy Green – Manchester
- Chorlton Water Park – Manchester
- Christian Fields – Lichfield
- Church Lane Flood Meadow
- Church Meadow
- Church Wood & Robsack Wood
- Churchills, Teignbridge – Teignbridge, Devon
- Clara Vale
- Clarksons Wood – Redcar and Cleveland
- Clayfield Copse
- Claygate Common
- Clayton Vale – Manchester
- Cleadon Hills
- Cleatop Park – Yorkshire Dales National Park
- Cleethorpes Sands – North East Lincolnshire
- Cleethorpes Country Park – North East Lincolnshire
- Cleeve Prior Bank
- Clifton Backies – York
- Clifton Country Park – Salford
- Clifton Grove, Clifton Woods and Holme Pit Pond – Nottingham
- Clincton Wood – Halton, Cheshire
- Clinkham Wood Community Woodland
- Coate Water
- Cock Robin Wood
- Cockglode and Rotary Wood – Nottinghamshire
- Cocksherd Wood
- Codsall Coppice – Sandwell, West Midlands
- Cogdean Elms
- Coke's Pit Lake
- Colemere – Shropshire
- Colliers Moss
- Colne, Wivenhoe – Colchester
- Colne Valley, Colchester – Colchester
- Colney Heath – St Albans
- Colwick Woods – Nottingham
- Colyford Common
- Cong Burn Wood – Durham
- Coningsby – Lincolnshire
- Conygre Mead
- Coombe Hill Wood
- Coombe Valley
- Coombes Quarry
- Cooper's Hill, Bedfordshire
- Coopers Hill - Gloucester
- Coppett Hill
- Coppett's Wood and Scrublands - Barnet, London
- Coppice Leasowes – Church Stretton, Shropshire
- Corbet Hospital
- Corbett Wood and Grinshill – Shropshire
- Corfe & Barrow Hills
- Corfe Hills
- Corston Quarry and Pond
- Cottage Bottom Fields
- Cotwall End – Dudley
- Covert Way
- Cow Plantation – Sedgefield, Co Durham
- Cowpen Bewley Woodland Country Park – Cleveland
- Cowraik Quarry – Eden, Cumbria
- Coxhoe Quarry Road – Durham
- Coyney Woods – Stoke-on-Trent
- Crab Wood
- Crackley Wood
- Cranberry Moss
- Crane Park Island (+ Hounslow)
- Crane Valley
- Cranebank
- Cranmer Green
- Crecy Hill (Managed by Tackley Parish Council)
- Cresswell Dunes
- Cromford Canal – Derbyshire
- Cromwell Bottom
- Crookhill Brickpits
- Cross Hill Quarry – Ribble Valley, Lancashire
- Cross Lane Meadows
- Cross O'Cliff Orchard – Lincolnshire
- Crossness
- Crow Trees – Durham
- Crowfields Common
- Crown Meadow – Stone
- Croxley Common Moor
- Croxteth - Liverpool
- Cuckoo's Nook and The Dingle – Walsall
- Cuddington Meadows
- Cunningham Clough - Bolton
- Curtis Wood
- Cuttle Brook
Read more about this topic: List Of Local Nature Reserves In England