The Prime Tower, also named "Maag-Tower" in an earlier stage of planning, is a skyscraper in Zurich, Switzerland. It is under construction as of 2009. Upon completion, which is scheduled for 2011, it will be the highest skyscraper in Switzerland at a height of 126 meters (413 ft).
The building is located near the Hardbrücke railway station. One seldom-used freight railway line is situated a few meters away from the building. The tower replaces an industrial facility that has been demolished.
The tower and its two companion buildings, Cubus and Diagonal, are intended to be used primarily as office buildings for law firms, banks and other clients.