C
- C-3PO's – A cereal based on the Star Wars character, C-3PO (1980s)
- Cabbage Patch Kids Cereal 1980s
- The California Raisins Cereal – Post Cereals
- Cap'n Crunch – Quaker Oats (1963 – present)
- Cap'n Crunch Crunch Berries – Quaker Oats (1967 – present)
- Cap'n Crunch's Oops! Choco Donuts – Quaker Oats (2003–2004)
- Captain Planet Cereal (1994)
- Caramel Crunchfuls- (2010 – present)
- Count Chocula
- Cat in the Hat Cereal – Kellogg's (2003–2004)
- Ceccettio's – Italian localization of General Mills' Cheerios.
- Cheerios – General Mills; Cereal Partners Worldwide in Europe. (1941–1945 named Cherrioats, renamed Cherrios to this day)
- Apple Cinnamon Cheerios (1988 – present)
- Banana Nut Cheerios (2008 – present)
- Berry Burst Cheerios (2003 – present)
- Berry Burst Cheerios – Strawberry (2003–?)
- Berry Burst Cheerios – Triple Berry (2003 – present)
- Cinnamon Burst Cheerios (2011–present)
- Chocolate Cheerios- (2010 – present)
- Frosted Cheerios (1995 – present)
- Fruity Cheerios (2006 – present)
- Honey Nut Cheerios (1979 – present)
- Millenios (Cheerios) (1999–2000)
- MultiGrain Cheerios (1991 – present)
- Oat Cluster Cheerios Crunch (2007 – present)
- Team (USA) Cheerios (1996) – (Special edition, discontinued)
- Yogurt Burst Cheerios – Strawberry (2004 – present)
- Yogurt Burst Cheerios – Vanilla (2004 – present)
- Chex – Ralcorp (now Ralcorp) (1937–1997); General Mills (1997 – present)
- Apple Cinnamon Chex (2012 - present)
- Chocolate Chex (2007 – present)
- Cinnamon Chex (2009 – present)
- Corn Chex (1958 – present)
- Double Chex (1990s)
- Frosted Mini-Chex (2002–2006)
- Honey Graham Chex (1986- early 1990s)
- Honey Nut Chex (1999 – present)
- Multi-Bran Chex (1990 – present)
- Rice Chex (1950 – present)
- Strawberry Chex (2008–2010)
- Sugar Chex (1970s)
- Wheat Chex (1937 – present)
- Choco Crunch (Original) – Quaker Oats (1980s)
- Choco Crunch (Re-introduced Version) – Quaker Oats (2007 – present)
- Chocapic – Nestle
- Chocolate Donutz – General Mills (Early 1980s)
- Chocolate Crunchfuls- (2010 – present)
- Chocolate Flakes – Kellogg's (not generally sold in U.S.)
- Chocolate Peanut Butter Corn Pops – Kellogg's – (2007)
- Chrebet Crunch (1999)
- Chocolate Oat Crunch Life – Quaker Oats Company (2006–2008)
- Chocolatey Peanut Butter Crunch – Quaker Oats (2006)
- Chocos – Kellogg's
- Christmas Crunch – Quaker Oats (1988 – present)
- Cinnamon Crunch – Quaker Oats (1970s)
- Cinnamon Crunch Crispix – Kellogg's (2001–2006)
- Cinnamon Grahams – United Kingdom
- Cinnamon Life – Quaker Oats (1978 – present)
- Cinnamon Mini-Buns (1991–1993)
- Cinnamon Marshmallow Scooby-Doo – Kellogg's (2002)
- Cinnamon Toast Crunch – General Mills (1984 – present)
- Cinnamon Toasters – Malt-O-Meal
- Circus Fun – General Mills (Late 1980s)
- Clackers – General Mills
- Clusters – General Mills
- Coco Roos – Malt-O-Meal
- Cookie Crisps
- CoCo Wheats – Little Crow Foods (1930 – present)
- Coco Pops – Kellogg's (known as Cocoa Krispies in some parts of the world. The generic equivalent sold under many different names)
- Cocoa Puffs – General Mills (1958 – present)
- Cocoa Puffs Combos (Vanilla and chocolate puffs mixed) – General Mills (2008)
- Cocoa Hoots – Kellogg's
- Colossal Crunch – Malt-O-Meal
- Comet Balls – Spix/Sulava & Company (2006 – present)
- Complete
- Concentrate – Kellogg's
- Cookie Crisp (1977 – present)
- Corn Bran
- Corn Bran Squares
- Corn Bursts – Malt-O-Meal
- Corn Pops – Kellogg's (1951 – present. Originally known as Sugar Pops.)
- Corn Flakes – Kellogg's (1907 – present)
- Corn Soya – Kellogg's
- Corny Snaps – Kellogg's (1970s)
- Cracklin' Oat Bran Kellogg's
- Cracker Jack Cereal – Ralston (1983)
- Cranberry Almond Crunch – Post Cereals (1997 – present)
- Cranberry Wheats – Tesco
- Cran-Vanilla Crunch – Kellogg's (2005–2007)
- Crazy Cow – General Mills (Late 1970s)
- Crazy Flakes – Tasty
- Cream of Wheat
- Crispix – Kellogg's – (1980s-Present)
- Crispy Critters – Post Cereals (1963-1980s)
- Crispy Rice – Malt-O-Meal
- Crispy Wheats 'n Raisins – (no longer in production)
- Cröonchy Stars – Post Cereals (1988–1989) featuring the Muppets Swedish Chef
- Crunch Berries – Quaker Oats
- Cruncheroos – Kellogg's (1990s)
- Crunchy Bran – Weetabix Limited
- Crunchy Corn Bran- Quaker Oats
- Crunchy Nut Cornflakes
Read more about this topic: List Of Breakfast Cereals