The Haus des Meeres (HdM, English: House of the Sea) is a public aquarium in Vienna, Austria. It is located in Esterhazy Park in the centre of Mariahilf district.

The Haus des Meeres houses over ten thousand aquatic beings on an area of around 4,000 square meters (43,000 sq ft) inside a tall concrete flak tower built during World War II.In 2012 the Haus des Meeres attracted a record high of 650,000 visitors.