Until 1 January 2007 Ledøje-Smørum was a municipality (Danish, kommune) in Copenhagen County on Zealand (Sjælland) island in eastern Denmark, then merged into Egedal.
The municipality covered an area of 31 km2 (12 sq mi) and had a total population of 10,525 (2005), northwest of nearby Copenhagen.
The last mayor of Ledøje-Smørum was Jens Jørgen Nygaard, a member of the Conservative People's Party (Det Konservative Folkeparti) political party.
The municipality had been created in 1970 as the result of a kommunalreform ("Municipality Reform") that merged a number of existing parishes: Ledøje-Smørum municipality ceased to exist as the result of Kommunalreformen ("The Municipality Reform" of 2007).
This created a municipality with an area of 126 km2 (49 sq mi) and a total population of 39,267 (2005).