This special technical publication consists of eight papers presented during the symposium on Fatigue and Fracture Toughness of Metallic Materials at the Seventy-sixth Annual Meeting of the American Society for Testing and Materials held in Philadelphia, Pa., 24-29 June 1973. The symposium was sponsored by the Low Temperature Panel of the American Society for Testing and Materials, American Society of Mechanical Engineers, and Metal Properties Council Joint Committee on the Effect of Temperature on the Properties of Metals. C. F. Hickey, Jr., Army Materials and Mechanics Research Center, and R. G. Broadwell, Titanium Metals Corporation of America, presided as symposium cochairmen.