The Hôtel Tassel is a townhouse built by Victor Horta in Brussels for the Belgian scientist and professor Emile Tassel in 1892–93. It is generally considered the first true Art Nouveau building, because of its highly innovative plan and its groundbreaking use of materials and decoration. It is located at 6, rue Paul-Emile Janson/Paul-Emile Jansonstraat.
Together with three other townhouses of Victor Horta, including Horta's own house and workshop, it was added to the UNESCO World Heritage list in 2000.
Not accessible to public.