Until 1 January 2007 Dianalund Municipality was a municipality (Danish, kommune) in West Zealand County on the island of Zealand (Sjælland) in east Denmark.
The municipality covered an area of 67 km2, and had a total population of 7,406 (2005).
Its last mayor was Per Hovmand, a member of the Conservative People's Party (Det Konservative Folkeparti) political party.
Dianalund Municipality ceased to exist as the result of Kommunalreformen ("The Municipality Reform" of 2007).
This created a municipality with an area of 317 km² and a total population of 28,336 (2005).