Hôtel Frison, Art Nouveau mansion in Pentagon district, Brussels, Belgium.

Hôtel Frison is a narrow Art Nouveau townhouse at Rue Lebeau 37, built by Victor Horta in 1894–1895. Its facade combines white stone with blue stone bands, wrought-iron balconies on the first and second floors, and a curved dormer above a mansard roof. The ground floor was altered in 1955 into a shopfront with large glass windows.

Maurice Frison, a socialist lawyer and member of the Belgian Workers Party, commissioned Victor Horta to design this residence and office building in 1894. The work emerged during a period when Horta was establishing the foundations of Belgian Art Nouveau and developing innovative solutions for urban housing.

The residence represents an early expression of Art Nouveau in Brussels, with organic forms in frescoes and architectural details that show the design philosophy of the time. These artistic elements define its overall appearance and show how beauty and function came together in residential architecture.

The building can be visited through organized tours offered by the Foundation Frison Horta at Rue Lebeau 37, providing access to the restored interior spaces. Visitors should check ahead to confirm tour availability, as these are scheduled regularly but not offered every day.

The ground-floor shopfront dates from 1955, when architect Claude Gérard converted the basement and ground level into a shop with a large display window. Its moulded frame copies the old bay above, and two consoles flank the first-floor balcony, which is actually held up by a modern load-bearing structure.