This Handbook is specifically designed as a guide to highway engineers. It was used as a textbook for the Federal Highway Administration (FHWA) training courses on the above title. Several methods of analysis and design of piles under lateral loading are in use. Two methods are presented: the method of Broms, and the method where nonlinear soil-response curves, p-y curves, are employed. The latter method is given prominence because of its versatility. A computer program is presented for solving the equations giving pile deflection, rotation, bending moment, and shear. An iterative procedure is employed internally in the computer program because of the nonlinear response of the soil. Nondimensional curves are presented that can be used for 'hand' solution of the differential equation. Several examples are solved and the material is presented in a manner to simplify the necessary computations.