Johannes Orphal (born 11 July 1966, in Magdeburg) is a German physicist.
He is Full Professor of Physics and Director of the Institute of Meteorology and Climate Research (IMK) at the Karlsruhe Institute of Technology (KIT).
His main scientific contributions are in the field of molecular spectroscopy applied to the Earth's atmosphere: laboratory measurements of unstable and reactive molecules and radicals, data evaluation for international databases e.g.
HITRAN, preparation and use of remote-sensing satellite missions (GOME, SCIAMACHY, MIPAS, MetOp, MTG ...) to observe stratospheric chemistry, tropospheric air quality and processes of relevance for climate, as well as the development of sensitive in-situ measurements techniques such as IBBCEAS.
In 2017, he was awarded the "Gentner - Kastler" Prize of the French and German Physical Societies (SFP and DPG) and the "Humboldt - Gay-Lussac" Prize of the Academie des Sciences in Paris.