C-14 - Rodlox

C-23 - Anthony Docimo

C-24 - Anthony Docimo

Cacone - Daniel Sacks

Cadhinor - Mark Rosenfelder

Cakish - Rory

C^al - Drydic_Guy

Calénnawn - René Uittenbogaard

Candabrach - Robert Schikowski

Çanil - Maknas

Canis - Ron de Leeuw

Cânnânn Naewinn - Gustaf Hansson

Cannic - Nikhil Sinha

Ca'olaeg

Carrajena - Adam Walker

Casta

Ceiteish - Eric Anger

Celltiecc - Duke Keenan; Nathaniel Ament-Stone; Dean Powell

Cenlatorre

Cepperjoleddicg - Chris Paull (Zeke Fordsmender)

Ceqli - Rex F. May

Cetonian - James E. F. Landau

Chanan

Charyan languages

Chevraqis

Chicken - Jack McLaren & Pat Spacek

Chickenese - Damon M. Lord

Chin'yn-theuk - script

Chipilak - Chipilak

Ch-m Tlondor - Jeff Lilly

Cho-ba - Thomas Leigh

Choton - Pascal A. Kramm

Chovur - J. Fatula

Chrodisonian - Roger Kuiper

Chrol - Apollo Hogan

Chunotl - Pablo Barenbaum

Chusole - Glenn Kempf

Cilthic - Daniel S. Andersen

Cinpzy - Dazi

Ciravesu

Cispa - Herman Miller

Clalia - John

Classical Yiklamu - Mark P. Line

Clavis Convenientiae Linguarum - Joachim Becher

cni-vcti - Omid Ghayour

Coastal Zein - Drydic_Guy

Coeniathen - Anselm Huppenbauer

Common Germanic - James Johnson

Comunleng

Çomyopregi - Damátir Ando

Conlangs of Destruction

Constructed Language #4892 - Justin B. Rye

Corint - Daniel Andreasson

Coronese

Cosmian - Wilbur M. Law Beatty

Crilatse - Jonathana Tegire

Criollo - Chlewey Thompin

Cruons - Stefan Lubbersen

Cuërna - Jack McNeill

Cuêzi - Mark Rosenfelder

Curco - Pablo Flores

Cyberyak - Eric Beaubien

Cytrurian - Martin

Czirehlat - Herman Miller