This third volume of the series Lectures in Optics provides a comprehensive presentation of the wave optics effects. The arguments underlying the concept of light as either a wave or a particle were part of the greatest revolution in physics, which, in the early 20th century, bore modern quantum and atomic optics. These fundamental advances set the stage for a crucial outcome, the laser. Many aspects of optics are strongly dependent on light s wave nature, including polarization (owing to the vector nature of light), absorption and dispersion (owing to the complex nature of the refractive index and the quantum nature of the photon), as well as interference and diffraction. The latter two effects are perhaps the greatest manifestations of the wave nature of light and provide an excellent demonstration of the power and simplicity of Fourier optics. After covering all of these effects in detail, Wave Optics introduces the concepts involved in laser light and its applications, engaging a historical and didactic approach. This book is suitable for advanced levels of Wave Optics courses in physics and engineering curricula, graduate programs, and professional programs, including optometric education. Each chapter ends with a simple yet adequate summary of the main points, aiming to reinforce an understanding of the covered material. Self-assessment is facilitated by ample practice examples, exercises, and quizzes.