This Special Technical Publication contains most of the papers presented at a Symposium on Fatigue at High Temperature held in San Francisco, Calif., during the Seventy-first Annual Meeting of ASTM, 23—28 June 1968. The topic was chosen because of its current timeliness and interest to those seeking answers to pressing questions regarding elevated temperature material behavior. The sponsor of this symposium was the Task Group on Fatigue under Cyclic Strain, now Subcommittee VIII of the E09 Committee on Fatigue. L. F. Coffin, Jr., General Electric Company Research and Development Center, presided as symposium chairman.