- bustard
- buster, southerly
- butcher
- butcher-bird
- buttercup
- butter-fish
- butterfly-conch
- butterfly-fish
- butterfly-lobster
- butterfly-plant
- button-grass
- buzzard
- cabbage garden
- cabbage-palm
- cabbage-tree
- cabbagites
- cabbage-tree mob
- cad
- caddie
- cadet
- caloprymnus
- camp
- camphor-wood
- canajong
- canary
- candle-nut
- cane-grass
- cape-barren goose
- cape-barren tea
- cape lilac
- cape weed
- caper-tree
- cooker
- Captain Cook
- carbora
- cardamom
- carp
- carpet-shark
- carpet-snake
- carrier
- carrot, native
- cascarilla, native
- cassowary
- casuarina
- cat-bird
- cat-fish
- cat, native
- catholic frog
- cat's eyes
- cat's-head fern
- catspaw
- cat's tail
- cattle-bush
- cattle-duffer
- cattle-racket
- caustic-creeper
- caustic-vine
- caustic-plant
- cavally
- cedar
- celery, australian
- celery-topped pine
- centaury, native
- centralia
- cereopsis
- channel-bill
- cheesewood
- cherry, herbert river
- cherry, native
- cherry-picker
- chestnut pine
- chewgah-bag
- chinkie
- chock-and-log
- choeropus
- Christmas
- christmas-bush
- christmas-tree
- chucky-chucky
- chum
- chy-ack
- cicada
- cider-gum
- cider-tree
- city
- claim
- clay-pan
- clear-skins
- clean-skins
- clearing lease
- clematis
- clianthus
- climbing-fish
- climbing-pepper
- clitonyx
- clock-bird
- clock, settlers'
- cloudy-bay cod
- clover-fern
- clover, menindie