The GEOMAR - Helmholtz Centre for Ocean Research Kiel (GEOMAR), formerly known as the Leibniz Institute of Marine Sciences (German: Leibniz-Institut für Meereswissenschaften, IFM-GEOMAR), is a research institute in Kiel, Germany.

It was formed in 2004 by merging the Institute for Marine Science (Institut für Meereskunde Kiel, (IFM)) with the Research Center for Marine Geosciences (GEOMAR) and is co-funded by both federal and provincial governments.

[5] GEOMAR offers degree courses in affiliation with the University of Kiel,[3] and operates the Kiel Aquarium[6] and the Lithothek, a repository for split sediment core samples.

[7] GEOMAR is structured into four research divisions:[8] GEOMAR operates two open ocean research vessels: the 36-year-old RV Poseidon (1050 GT)[14] and the 20-year-old RV Alkor (1000 GT).

[18] In addition it operates JAGO, a three-ton research submersible, the only manned research submersible in Germany,[4][19][20] capable of diving to 400 metres,[21] as well as a remotely operated underwater vehicle, ROV KIEL 6000 capable of diving to 6,000 metres,[22] an autonomous underwater vehicle, AUV ABYSS,[23] and a video-controlled hydraulic grab, TV-Grab.