These notes are prepared for the physics course FYS 3120, Classical Mechanics and Electrodynamics, at the Department of Physics, University of Oslo. The course consists of three parts, where Part I gives an introduction to Analytical Mechanics in the form of Lagrange and Hamilton theory. In Part II the subject is Special Relativity, where four-vector notation for vectors and tensors are introduced and applied to relativistic kinematics and dynamics. Finally in Part III electrodynamics is discussed from the point of view of solutions of Maxwell’s equations, with special focus on relativistic transformations and the radiation phenomenon.