Fladså
Fladså was a municipality in Storstrøm County in south Denmark. The municipality covered an area of 133 km2, and had a total population of 7,581. Its last mayor was Hans R. Hansen, a member of the Venstre political party.
The seat of its municipal council was at Mogenstrup.
Neighboring municipalities were Rønnede to the east, Holmegaard to the north, Næstved to the west, and Præstø and Vordingborg to the south. Fakse Bay made up part of the municipality's eastern border, and Karrebæksminde Bay. The new municipality will belong to the new Region Sjælland.