The Institute for Chemistry and Biology of the Marine Environment of the Carl von Ossietzky University of Oldenburg (, abbreviated ICBM)
is one of the marine science institutes at the German coast and the only university-based marine research institute in Lower Saxony, Germany.
The ICBM is located on the campus Wechloy in Oldenburg, with locations in Wilhelmshaven  and on the island of Spiekeroog (in relation to the national park centre Wittbülten on the area of the Hermann Lietz School). The ICBM operates the Wadden Sea time series station Spiekeroog (WSS) and several research vessels.