Peter Simon Liss CBE FRS (born 27 October 1942) is a British environmental scientist, and professorial fellow, at the University of East Anglia.
Liss studied at Durham University, earning a BSc. He then completed a PhD at the University of Wales.
His research group is a part of the Laboratory for Global Marine and Atmospheric Chemistry (LGMAC). He is a member of the Solar Radiation Working Group.
He was awarded the Challenger Society Medal in 2000 and the John Jeyes Medal of the Royal Society of Chemistry in 2003/04.