Esterházypark, Urban park in Mariahilf, Austria.

Esterházypark is a park in Vienna's Mariahilf district, laid out in the 18th century and bordered by Schadekgasse, Kaunitzgasse, Gumpendorfer Straße, Blümelgasse, Amerlingstraße and Chwallagasse. A chestnut avenue runs through it, and the 1944 fire-control tower of the Stiftskaserne/Esterházypark flak tower pair dominates the grounds. The tower now houses Haus des Meeres, with a climbing wall on its outer side.

The park takes its name from the noble Esterházy family, an influential aristocratic line in Austrian history. A World War II anti-aircraft tower stands on the grounds and has been repurposed for contemporary recreational use.

The park is named after the Hungarian Esterházy family, who owned the former Palais Kaunitz here from 1814 to 1868, when the area was still a suburb. Four listed baroque stone figures stand by the entrance on the Gumpendorfer Straße wall; they were moved here in 1886 from the former Lazansky-Haus at Stock im Eisen. The large area with the bunker and flak tower is addressed as Fritz-Grünbaum-Platz 1, after the Viennese artist Fritz Grünbaum.

The park is bounded by Schadekgasse, Kaunitzgasse, Gumpendorfer Straße, Blümelgasse, Amerlingstraße and Chwallagasse. The bunker and flak tower stand on the plot addressed Fritz-Grünbaum-Platz 1, and the square's traffic area adjoins the park to the east between Schadekgasse, Windmühlgasse and Gumpendorfer Straße. The climbing wall on the tower's outer side is maintained by Alpenverein Austria. Four baroque stone figures stand on the enclosure wall at the Gumpendorfer Straße entrance.

The park's address, Fritz-Grünbaum-Platz 1, honours the Viennese cabaret artist Fritz Grünbaum, who was murdered in the Dachau concentration camp in 1941. Below the grounds lies a Second World War civil-defence bunker built for 300 people, now housing a torture museum. Four listed Baroque stone figures stand by the Gumpendorfer Straße entrance, moved here in 1886 from the former Lazansky-Haus at Stock im Eisen.