This chapter provides a basic introduction to classical charged particle beam optics before proceeding to the development of quantum charged particle beam optics in later chapters. Charged particle beam optics is the study of transport of charged particle beams through electromagnetic optical systems. Such systems, like different types of electromagnetic lenses used for focusing or defocusing the beams, bending magnets, etc., are the main components of charged particle beam devices – low energy electron microscopes to high energy particle accelerators. This chapter gives a brief account of the classical mechanics of a few magnetic and electrostatic optical elements and the dipole magnet which will serve as examples for the formalism of quantum charged particle beam optics.