Parco Sempione ("Simplon Park") is a large city park in Milan, Italy. Established in 1888, it has an overall area of 386,000 m², and it is located in the historic centre of the city, inside the Zone 1 administrative division. It owes its name to Corso Sempione, a major thoroughfare of Milan, dating back to the Napoleonic Empire. The park is adjacent to the gardens of the Sforza Castle and to the Arch of Peace, two of the prominent landmarks of Milan. The very design of the park, due to architect Emilio Alemagna, was conceived with the intent of creating panoramic views encompassing both monuments. A third prominent monument of Parco Sempione is the Palazzo dell'Arte ("Palace of Art"), built in 1933 and designed by Giovanni Muzio, which currently houses the Triennale di Milano art expo.
Other places of interest within the park include the Arena Civica, the public aquarium, and the Torre Branca tower.
The whole area of the park is covered by a free wireless network.