Oceanic bubble distributions have a profound influence on the acoustical environment of the upper ocean. This book provides a mathematical and physical description of bubbles in the ocean and their role in determining the acoustical environment. A distinctive feature is the use of an integrated description of the physics and behavior of bubbles near the ocean surface, their creation, organization into bubble clouds and their subsequent dissolution or escape, as the basis for explaining their active and passive acoustical effects, including their influence on acoustical propagation. The description draws on laboratory and field observations, and is supported by a concise mathematical treatment of the relevant processes.