The Murinsel (German, literally Mur island) in Graz, Austria, is actually not an island at all, but an artificial floating platform in the middle of the Mur river, located at . This landmark of Graz was designed by New York artist Vito Acconci on the occasion of Graz becoming the 2003 European Capital of Culture.

The building in the form of a giant sea shell measures 50m in length and 20m in width. Two footbridges connect it with both banks of the Mur. The center of the platform forms an amphitheatre. Below a twisted round dome there is a café and a playground. The Murinsel is built for a maximum number of 350 visitors.

Image:Murinsel fern.jpg|MurinselImage:Murinsel_Acconci.JPG|Murinsel - MurinselImage:Murinsel-Graz-Nacht.jpg|Murinsel at nightImage:IMG 0552 - Graz - Murinsel (foreground) and Schlossberg (background).JPG|Murinsel at nightImage:IMG 0551 - Graz - Murinsel.JPG|Murinsel at nightImage:IMG 0544 - Graz - Murinsel.JPG|Upon the Murinsel at night