Victor, Baron Horta (6 January 1861 - 8 September 1947) was a Belgian architect and designer. John Julius Norwich described him as "undoubtedly the key European Art Nouveau architect." Indeed, Horta is one of the most important names in Art Nouveau architecture; the construction of his Hôtel Tassel in Brussels in 1892-3 means that he is sometimes credited as the first to introduce the style to architecture from the decorative arts. The French architect Hector Guimard was deeply influenced by Horta and further spread the "whiplash" style in France and abroad.

In 1932 King Albert I of Belgium conferred on Horta the title of Baron for his services to architecture. Four of the buildings he designed have been designated a UNESCO World Heritage Site.