Bernard Frank (March 7, 1902 – November 15, 1964) was an American forester and wilderness activist. He is known for being one of the eight founding members of The Wilderness Society. Frank was born in New York City. He studied at Cornell University, receiving his bachelor's and master's degrees. In 1927, he joined the United States Forest Service in the United States Department of Agriculture. He worked for the Forest Service for more than 30 years, usually in positions in the Forest Service headquarters in Washington, D.C.. He often worked with other agencies like the Tennessee Valley Authority or committees of Congress on matters related to forestry and water.