Paul R. Ehrlich (born 1932), is a Stanford University professor and a renowned entomologist specializing in Lepidoptera (butterflies). He is the author of the controversial book The Population Bomb and other books which apply the lessons of population zoology to economic issues such as resource use and population growth. His predictions of massive global starvation and resource depletion are controversial. He was also loser of the famous wager between Julian Simon and Paul Ehrlich.

With Stephen Schneider and two other authors, he critiqued Lomborg's "The Skeptical Environmentalist".