"Sound-Flow Interactions" is a specialized book that addresses the complex interplay between acoustic waves and the movement of fluids. These interactions are fundamentally nonlinear, meaning that both the flow and sound influence each other in their generation and propagation characteristics. The book is the result of an international school aimed at discussing the fundamentals of these interactions, exchanging expertise and methods, and promoting collaboration between various disciplines such as applied mathematics, acoustics, and fluid mechanics. It offers a collection of educational lectures and serves as both a compact reference for experienced researchers and an advanced textbook for graduate students and non-specialists who wish to engage deeply with this fascinating topic.