Pier Vellinga (1950) is professor in Environmental Sciences and Climate Change at Wageningen University Research and Vrije Universiteit Amsterdam.

Originally he specialised in Coastal Engineering contributing to the Deltaplan of the Netherlands. In 1987 he became advisor to the Netherlands Environment Minister on Climate Change. In that period he helped to shape international climate policies and he was one of the initiators and first bureau members of the Intergovernmental Panel on Climate Change. In 1991 he joined the Vrije Universiteit as professor in environmental sciences and as director of the Institute for Environmental Studies. In 2007 he took up a position at Wageningen University Research as well, to lead the National Climate Change Research programma: Knowledge for Climate.

Pier Vellinga is a board member of several research institutes and environmental organisations in the Netherlands and abroad.