Fatigue tests of type 316 and 316LN stainless steel were conducted at RT and 600 degrees C, 0.8 similar to 1.5% strain range for low cycle fatigue (LCF), 300-600 degrees C, 0% strain range for thermal fatigue (TF) and 300-600 degrees C, 2% strain range, in-phase or out-of-phase for thermomechanical fatigue (TMF). LCF, TF, and TMF lives were increased but saturation stresses were decreased with the addition of nitrogen. The higher temperature was the lower TF life at a same temperature change. The minimum temperature change for TF failure was more than 100 degrees C. TMF life was higher at in-phase condition than at out-of-phase condition. Fracture mode was transgranular for LCF and out-of-phase of TMF and almost transgranular and small intergranular for TF and in-phase TMF.