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- Pac-Man – General Mills (Early 1980s)
- Palaseja – Lithuania (1994)
- Peanut Butter Cookie Crisp – General Mills (2005)
- Peanut Butter Crunch – Quaker Oats (1969 – present)
- Peanut Butter Toast Crunch – General Mills (2004–2005)
- Pebbles Cereal – Post Cereals (1969 – Present)
- Bamm-Bamm Berry Pebbles – Post (2007–2009)
- Cinna-Crunch Pebbles – Post Cereals (1998–2001)
- Cocoa Pebbles – Post Cereals (1970 – present)
- Cupcake Pebbles – Post Cereals (2009–2011)
- Dino Pebbles – Post Cereals (Early 1990s)
- Dino S'mores Pebbles – Post Cereals (2008)
- Fruity Pebbles – Post Cereals (1969 – present)
- IceBerry Pebbles – Post Cereals (2006–2007)
- Limited Edition Smurfs Pebbles – Post Cereals (2011–)
- Marshmallow Mania Pebbles – Post Cereals (2005–2007)
- Marshmallow Pebbles – Post Cereals (2010–)
- Pebbles Boulders – Post Cereals (2011–)
- Winter Fruity Pebbles – Post Cereals (2003)
- Pep – Kellogg's
- Pink Panther Flakes – Post Cereals (1972–1974)
- Pirates of the Caribbean Cereal – Kellogg's (2006–2007)
- Pokémon Cereal – Kellogg's (2000)
- Pop-Tarts Crunch – Kellogg's (Mid 1990s)
- Powdered Donutz – General Mills (Early 1980s)
- Product 19 – Kellogg's (1967 – present)
- Pro Grain Cereal Kellogg's (1987–1988)
- Pro Starz (feat. Wayne Gretzky on the covers).
- Pronutro, Bokomo, South Africa
- Puffa Puffa Rice – Kellogg's (1967–1975)
- Puff – Kashi
- Puffed Rice – (Quaker Oats) (Malt-O-Meal)
- Puffed Wheat – (Quaker Oats) (Malt-O-Meal)
- Puffkins – UK, c.1960
- Puffins – Barbara's Bakery, early 1990s
- Punch Crunch – (Quaker Oats) (1970s)
Read more about this topic: List Of Breakfast Cereals