"Waves in the Ocean and Atmosphere" is a specialized book based on over twenty years of experience in the field of physical oceanography. It was developed as part of the Joint Program in Physical Oceanography at MIT and the Woods Hole Oceanographic Institution, targeting students of geophysical fluid dynamics and physical oceanography. The book provides a comprehensive introduction to wave theory, which is relevant for both oceanographers and meteorologists. The content is derived from course notes created by Joseph Pedlosky and reflects the enthusiasm of students for wave phenomena. The text covers fundamental concepts of wave theory and describes specific types of waves that are of particular interest to both disciplines. The topics addressed range from small surface gravity waves to large-scale planetary vortex waves, offering a valuable resource for anyone engaged in the dynamic processes of oceans and the atmosphere.