The Thermohaline Finestructure of the Ocean is a five-chapter text that describes the fine-scale stratification phenomenon in the ocean and the physical processes that participate in its formation and govern its evolution. After an introduction to the concept of thermohaline finestructure of the ocean, this book goes on presenting some methodological aspects in connection with the finestructure measurements in the ocean. The next chapters examine the complex interrelations between the fine-scale stratification of the ocean water. The remaining chapters explore several important physical processes, such as molecular diffusion, convection, turbulence, internal gravity waves, inertial motions, and mean currents. This book is written for physical oceanographers and specialists in other related branches of research.