R
- Rainbow Brite Cereal – Ralston (1985)
- Raisin Bran – Kellogg's – (1950 – present)
- Raisin Bran – Post
- Raisin Bran Crunch – Kellogg's (1999 – present)
- Raisin Life – Quaker Oats (1980s)
- Raisin Nut Bran – General Mills
- Raisin Squares – Kellogg's
- Raisin Wheats – Kellogg's – (?-Present)
- Ready Brek – Weetabix Limited
- Reese's Puffs – General Mills (1994 – present)
- Reptar Crunch – Post (1999)
- Rice Bubbles
- Rice Honeys Nabisco
- Rice Krinkles – Post (1951-1970s)
- Rice Krispies – Kellogg's – (1929 – present)
- Apple Cinnamon Rice Krispies – Kellogg's (1980s–1990s)
- Berry Krispies – Kellogg's (2006–2008)
- Cocoa Krispies – Kellogg's (1958 – present)
- Cocoa Krispies Choconilla – Kellogg's (2007–2009)
- Frosted Krispies – Kellogg's (Known as Ricicles in the United Kingdom)
- Fruity Marshmallow Krispies – Kellogg's (1987-late 1990s)
- Honey Rice Krispies – Kellogg's – (1996 – present) (Available only in The UK)
- Jumbo Krispies – Kellogg's (2009 – 2011)
- Marshmallow Rice Krispies – Kellogg's (1982–1993)
- Razzle Dazzle Rice Krispies – Kellogg's (1997–2000)
- Rice Krispies With Real Strawberries – Kellogg's (2007–2009)
- Rice Krispies Treats Cereal – Kellogg's (1993 – present)
- Rice Krispies with Vanilla Flavour – Kellogg's (Available only in Canada)
- Strawberry Rice Krispies – Kellogg's (1983) and (1997)
- Richard Petty 43's – General Mills
- Rocky Road – General Mills (1986 - 1987)
- Rail Road tracks – Joey Mickladlen (1986)
Read more about this topic: List Of Breakfast Cereals