The Hallerbos is a forest in Belgium. It covers an area of 552 hectares. It is mostly in the municipality of Halle, in Flemish Brabant. It used to be part of the Sonian Forest, but now it is separate, because of the growth of settlements around it in the 19th century, which reduced the size of the forest and divided it.
The forest is known in the region for its bluebell carpet. Bluebells cover the forest floor for a few weeks each spring, attracting many visitors in April and May.
