Claude Lorius (born 1932) is a French glaciologist. He is director emeritus of research at CNRS. He was the director of the Laboratoire de glaciologie et geophysique de l'environnement in Grenoble from 1983 to 1988.
He has taken part in more than 20 polar expeditions, mostly to Antarctica, and has helped organise many international collaborations, notably the Vostok Station ice core. He was instrumental in the discovery and interpretation of the palaeo-atmosphere information within ice cores.
- commandeur of the Légion d'honneur, 2009
- Blue Planet Prize, 2008
- Vernadsky medal of the EGU, 2006 
- CNRS Gold Medal, 2002
- Balzan Prize 2001 for climatology
- Tyler Prize for Environmental Achievement, 1996
- officer of the Légion d'honneur, 1998
- member of the French Academy of Sciences, 1994
- Italgas Prize, 1994
- Belgica Medal, 1989
- Humboldt Prize, 1988
- Bower Medal and Prize, Franklin Institute, 2017, 2017
- Jouzel, Jean, Claude Lorius and Dominique Raynaud (2012). The white planet : the evolution and future of our frozen world. Princeton, N.J.: Princeton University Press.
- Ice and the Sky, a documentary film about Lorius' work in Antarctica
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