Knud Andersen may refer to:

Knud Andersen (cyclist) (1922–1997), Danish cyclist Knud Andersen (footballer, born 1900) (1900–1967), Danish footballer Knud Andersen (footballer, born 1917) (1917–2003), Danish footballer Knud Andersen (mammalogist) (1867–1918), Danish zoologist K. B. Andersen (1914–1984), Danish politician