C. concinna may refer to:
Caladenia concinna, a Western Australian orchid Callopistria concinna, an owlet moth Calyptranthes concinna, a flowering plant Canavalia concinna, a jack-bean Canna concinna, a perennial plant Caprella concinna, a skeleton shrimp Carex concinna, a North American sedge Castanopsis concinna, a Chinese tree Cerceris concinna, a sphecoid wasp Chaetocnema concinna, a leaf beetle Chrysemys concinna, a freshwater turtle Clarkia concinna, a Californian wildflower Coelogyne concinna, a sympodial epiphyte Crosseola concinna, a sea snail Cyclaspis concinna, a cumacean crustacean