Roosdaal () is a municipality located in the Belgian province of Flemish Brabant. The municipality comprises the towns of Borchtlombeek, Onze-Lieve-Vrouw-Lombeek, Pamel and Strijtem. It is also situated in the Pajottenland.
On January 1, 2016, Roosdaal had a total population of 11,494. The total area is 21.69 kmò which gives a population density of 530 inhabitants per kmò. Roosdaal is well known in Flanders for its berries through its annual strawberry convention. One of its most notable tourist attractions is the historic Hertboom Windmill.
In 2008, during a national television competition, Onze-lieve-vrouw-Lombeek was voted "The most beautiful village in Flemish Brabant", but it lost the overall Flemish competition to the town of Oud-Rekem.