This chapter contains sections titled: Notation Stress Concentration Stress Concentration as a Two-Dimensional Problem Stress Concentration as a Three-Dimensional Problem Plane and Axisymmetric Problems Local and Nonlocal Stress Concentration Multiple Stress Concentration Theories of Strength and Failure Notch Sensitivity Design Relations for Static Stress Design Relations for Alternating Stress Design Relations for Combined Alternating and Static Stresses Limited Number of Cycles of Alternating Stress Stress Concentration Factors and Stress Intensity Factors References