Dallas Lynn Peck (March 28, 1929 – August 21, 2005) was an American geologist and volcanologist.

He spent his early career studying the volcanoes and volcanic rocks of Hawaii and the western United States.

[3] Dallas Peck was an authority on volcanoes who served as director of the U.S. Geological Survey from 1981 to 1993.

During his tenure, he expanded the scope of the survey's work on mineral resources, global change, water quality and mapping.

Following his term as Director, he returned to the Geologic Division of USGS in 1993 to conduct research on the granites of Yosemite National Park and the Sierra Nevada and to serve as adviser in the Office of the Chief Geologist.