| CR | Cookie Run | Mobile game |
| CRK | Cookie Run: Kingdom | 2020 video game developed by Devsisters |
| CRO | Cookie Run: Ovenbreak | Video game developed by Devsisters |
| CRW | Cookie Run Wiki | independent encyclopedia about the Cookie Run franchise |
| C | CoolGuyKai | Internet Celebrity |
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Coolio | American rapper (1963–2022) |
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Cordelia Chase | fictional character from Buffy the Vampire Slayer |
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Corinne Bailey Rae | British singer |
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Cornelius Fudge | fictional character from Harry Potter |
| C | corporation | in the United States, a business entity incorporated under any state or territorial statute |
| CA | Corvo Attano | fictional character from Dishonored |
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Cory Doctorow | Canadian-British-American blogger, journalist, and science fiction author |
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Cory Gardner | United States Senator from Colorado |
| CM | Cory Matthews | |
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Cosette | fictional character from Les Misérables |
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Cosimo de' Medici | First ruler of the Medici political dynasty (1389–1464) |
| CO | Count Olaf | fictional character from A Series of Unfortunate Events |
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Courteney Cox | American actress and producer (born 1964) |
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Courtney Cox | musician from the United States |
| CS | Coyote Stark | fictional character from Bleach |
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Craig Mabbitt | American singer |
| CM | Craig Middlebrooks | fictional character from Parks and Recreation |
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Craig Roberts | Welsh actor |
| CSW | Craig Steven Wright | Australian computer scientist and businessman |
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Creed Bratton | American actor and musician (born 1943) |
| CA | Creepshow Art | Commentary/Drama Youtuber |
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Criss Angel | American illusionist (born 1967) |
| CY | Cristina Yang | fictional character from Grey's Anatomy |
| C | Crixus | Gallic gladiator and military leader in the Third Servile War |
| C | Crocodile | fictional character from One Piece |
| C | Crona | fictional character from Soul Eater |
| C | Cruella | 2021 film directed by Craig Gillespie |
| CDV | Cruella de Vil | fictional character from Descendants |
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Cruella de Vil | fictional character from 101 Dalmatians II: Patch's London Adventure |
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crying | shedding tears as a response to an emotional state in humans |
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Crywank | British anti-folk band |
| CF | C.T. Fletcher | American powerlifter |
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Cthulhu | fictional character from Cthulhu Mythos |
| C | CT-SiFe | Types from Auburn's system, https://cognitivetype.com, assuming I--- development. |
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Cuba | sovereign state situated on an island in the Caribbean Sea |
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Cuco | Mexican-American singer-songwriter |
| CC | Cui Chan | fictional character from Sword, Come! |
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Cupid | |
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Curly Howard | American comedian as one of the Three Stooges (1903-1952) |
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Curtis LeMay | American general and politician (1906–1990) |
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Curtis Sliwa | American politician, talk radio show host, and founder of the Guardian Angels (born 1954) |
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Curt Smith | English musician and current member of Tears for Fears |
| CWC | C. West Churchman | American philosopher and systems scientist (1913-2004) |
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Cyborg | fictional character from DC Comics Presents |
| C | Cyclops | fictional character from Uncanny X-Men |