Gerta Keller (born 1945) is a paleontologist who contests the Chicxulub crater as the location of the meteorite impact, postulated as the cause of the Cretaceous-Tertiary extinction event 65 mya by the Alvarez hypothesis . Keller is currently a professor of Geosciences, at Princeton University .

Keller earned a doctorate in paleontology and geology from Stanford University in 1978, and then worked for the US Geological Survey and Stanford. She came to Princeton University in 1984 and after a few years started studying the K-T boundary, the geological signature of the Cretaceous-Tertiary extinction event.