- kooliman
- coolaman
- cooper's-flag
- coopers-wood
- coordaitcha
- coot
- copper-head
- copper maori
- coprosma
- coral
- coral-fern
- coral-flower
- coral pea
- coranderrk
- cordage-tree
- corella
- cork-tree
- corkwood
- cormorant
- cornstalk
- correa
- corrobbery
- corypha-palm
- cottage
- cotton-bush
- cotton-shrub
- cotton-tree
- cotton-wood
- coucal
- count-fish
- count-muster
- cowdie
- cowshorns
- cow-tree
- crab
- crab-hole
- crab-tree
- cradle
- crake
- cranberry(, native)
- crane
- craw-fish
- crawler
- cray-fish
- creadion
- cream of tartar tree
- creek
- creeklet
- creeper
- cronk
- crow
- crow-shrike
- crush
- cuckoo
- cuckoo-shrike
- cucumber-fish
- cucumber-mullet
- cultivation paddock
- curlew
- currijong
- currajong
- currant, native
- currant, plain
- currency
- cushion-flower
- cut out
- cutting-grass
- dabchick
- dacelo
- dactylopsila
- daisy, brisbane
- daisy, native
- daisy-tree
- dam
- dammara
- damper
- damson, native
- dandelion, native
- daphne, native
- darling pea
- darling shower
- dart
- darter
- dasyure
- date, native
- deadbeat
- dead-bird
- dead-finish
- dead-wood fence
- deal, native
- december
- deepsinker
- deep yellow-wood
- deferred payment
- dell-bird
- dendrolagus
- derry
- dervener
- derwenter
- desert lemon