The book "Classical Electromagnetic Theory" is a comprehensive and well-founded introduction to classical electromagnetism, based on a series of lecture notes created over several years for students of physics and electrical engineering. This second edition is aimed at learners who already have a basic understanding of electricity and magnetism. The initial chapters serve as a review and facilitate the transition to more complex topics. The work is structured to be covered over two semesters, making it suitable for newcomers who wish to familiarize themselves with the fundamentals. The selection of topics allows for specific content to be tailored according to the needs and prior knowledge of the students, making the book a flexible teaching tool.