Alan Claude Ferguson (January 13, 1923 – June 15, 2006), who went by A. Claude Ferguson, was an American forester, conservationist, and environmentalist. After a 33-year career employee of the U.S. Forest Service, he chose to work with environmental groups as he joined lawsuits against his employer, the U.S. Forest Service. The protest began in 1970 against off-road vehicle trails in the Hoosier National Forest and ended in a 1976 civil servant hearing for unlawful termination and a federal lawsuit citing violations of the Forest Service Trail Standards and on land that was acquired for wildlife habitat by the Indiana Department of Natural Resources.