Thomas Wellock (born 1959) is the American historian for the U.S. Nuclear Regulatory Commission. Trained as both an engineer and a historian, he writes scholarly histories of the regulation of commercial nuclear energy. His most recent book is Safe Enough? A History of Nuclear Power and Accident Risk with the University of California Press in 2021. Wellock also published Preserving the Nation: The Conservation and Environmental Movements, 1870-2000 in 2007.