Parc du Cinquantenaire (French for "Park of the Fiftieth Anniversary", or Jubelpark (Dutch for "Jubilee Park", is a large public, urban park (30 hectares) in the easternmost part of the European Quarter in Brussels, Belgium.
Most buildings of the U-shaped complex which dominate the park were commissioned by the Belgian government under the patronage of King Leopold II for the 1880 National Exhibition commemorating the fiftieth anniversary of Belgian independence, and successive exhibitions which place in the same area, replacing previous constructions. The present centrepiece triumphal arch was erected in 1905 replacing a previous temporary version of the arcade by Gédéon Bordiau. The structures were built in iron, glass and stone, symbolising the economic and industrial performance of Belgium. The surrounding 30 hectare park esplanade was full of picturesque gardens, ponds and waterfalls. It housed several trade fairs, exhibitions and festivals at the beginning of the century. This settled however in 1930 when it was decided that Cinquantenaire would become a leisure park.