Listed here are Hawaiian plant common names that begin with the letter C.
- Calathea, Blue Ice
- Calathea, Ice Blue
- Calathea, White Ice
- Candle Bush
- Candlebush
- Candlenut
- Candlestick Senna
- Candlewick
- Canereed
- Canna, Edible
- Canna, Wild
- Cape Leadwort
- Cape Plumbago
- Cardinal's Hat
- Carilla Gourd
- Castor Bean
- Castor Oil Plant
- Castorbean
- Casuarina, Horsetail
- Cat's Whiskers, Blue
- Cathedral Bells
- Cattletongue
- Cattley Guava
- Centipede Tongavine
- Cestrum, Night
- Cestrum, Night-flowering
- Chandelier Tree
- Chinese Ground Orchid
- Chinese Hibiscus
- Chinese Lantern
- Chinese Violet, Small
- Christmas Berry
- Christmas Tree Clubmoss
- Christmas-candle
- Clerodendrum, Butterfly
- Clidemia
- Climbing Dayflower
- Climbing Fern
- Clock Vine, Bengal
- Clock-vine, Sweet
- Clock-vine, White
- Club-moss, Nodding
- Clubmoss, Christmas Tree
- Clubmoss, Staghorn
- Clusia, Florida
- Coconut Palm
- Coffee
- Coffee, Arabian
- Coffee, Arabica
- Coffee, Kona
- Coleus
- Coleus, Common
- Columnar Araucaria
- Common Coleus
- Common Ironwood
- Common Mullein
- Cook Araucaria
- Cook Pine
- Copey
- Coprosma, Black-fruited
- Coral Creeper
- Coral Hibiscus
- Coral-beadplant
- Cow Pea
- Cowpea
- Crab Claw
- Crab's Eye
- Crane Flower
- Crane Lily
- Crape Ginger
- Crassocephalum
- Cream Garland-lily
- Cream Ginger
- Creeping Barleria
- Creeping Daisy
- Creeping Foxglove
- Creeping Ox-Eye
- Creeping-oxeye, Bay Biscayne
- Crepe Ginger
- Crimson Passionflower
- Cucumber, Bitter
- Cupid's Shaving Brush
- Cure For All
- Currant, Bush