C
- Caldecote [Cambs]: TL348570
- Caldecote [Hunts]: TL145883
- Caldecote Manor Farm: TL225584
- Cam Washes (Upware): TL536700
- Cam Washes (Waterbeach): TL531696
- Cambourne: TL320590
- Cambridge Botanic garden: TL455573
- Cambridge Research Park: TL483680
- Cambridge STW: TL473618
- Cantelupe Farm Reservoir: TL418540
- Car Dyke (Waterbeach): TL495645
- Car Dyke (Werrington): TF170052
- Carlton: TL645535
- Castle Camps: TL633432
- Castor: TL125985
- Castor Hanglands: TF120015
- Castor Mill: TL128968
- Catworth: TL088730
- Catworth Hill: TL084737
- Cawdle Fen: TL535785
- Caxton: TL302584
- CEGB Reservoir: TL188953
- Central Park Peterborough: TL196999
- Chain Corner: TL417783
- Chatteris: TL390860
- Chatteris Fen: TL3880
- Chear Fen: TL5071
- Cherry Hinton Cement Pits: TL478575
- Cherry Hinton East Pit: TL485555
- Cherry Hinton Hall: TL482565
- Cherry Hinton West Pit: TL482557
- Chesterton [Cambs]: TL465605
- Chesterton [Hunts]: TL127955
- Chesterton Fen: TL482612
- Cheveley: TL685605
- Childerley Hall: TL355615
- Chilford Hall: TL567489
- Chippenham Fen: TL645695
- Chittering: TL500700
- Chrishall Grange: TL444428
- Christchurch: TL493965
- Clay Farm - See Trumpington (Clay Farm)
- Clayhithe: TL502644
- Clayway Farm: TL570830
- Coates: TL307978
- Cobb's Wood: TL347515
- Cock Inn Farm (Isleham) - See Isleham (Cock Inn Farm)
- Coe Fen: TL448578
- Coldham: TF434028
- Coldham's Common: TL475585
- College Farm (Duxford) - See Duxford (College Farm)
- Colne Fen GP: TL385775
- Comberton: TL380560
- Comberton (Westfield Farm): TL380549
- Conington [Cambs]: TL320663
- Conington [Hunts]: TL175860
- Conington Airfield: TL185870
- Conington Fen: TL205860
- Conington Wood: TL205860
- Copley Hill: TL510531
- Coploe Hill: TL491423
- Coppingford Wood: TL175803
- Coton: TL406586
- Coton Countryside Reserve: TL413577
- Cottenham: TL448674
- Cottenham (Long Drove): TL470683
- Coveney: TL490820
- Coveney reserve: TL48R
- Cow Lane GP - See Godmanchester GP
- Cow Pasture Gorse: TL136833
- Crafts Hill: TL390629
- Crane Hill: TL197553
- Crown Lakes CP: TL195943
- Croxton Park: TL250595
- Croydon: TL312494
- Cygnet Park Peterborough: TL183953