K
- Kaboom! – General Mills (1969 – present: Limited Distribution)
- Kashi
- Keebler Cookie Crunch Cereal – Kellogg's (2008 - 2010)
- King Vitaman – Quaker Oats (1970 – present)
- Kix – General Mills (1937 – present)
- Berry Berry Kix
- Honey Kix
- Koko Krunch – Nestlé – (Asia)
- Krave (2012 - present)
- Krispy Kritters 1960s – 1980s General Foods
- Krumbles-Kellogg's (1913–1973 )
- Krunchios (1989 )
- Krusty-O's – fictional breakfast cereal, one of the many products produced from The Simpsons. This cereal was produced in limited quantities and sold at 7-Eleven convenience stores as a promotional item for The Simpsons Movie.
- Kung Fu Panda Crunchers cereal – Kellogg's / DreamWorks (2008)
Read more about this topic: List Of Breakfast Cereals