Acoustic insulation, also known as soundproofing, is the process of preventing the transmission of unwanted sound through an object or building structure. This is achieved by using materials and techniques that absorb, reflect or scatter sound waves, thereby reducing the amount of sound entering or leaving a given space.

In the construction industry, acoustic insulation is often used to reduce noise pollution in homes, offices, theaters and other buildings. This can range from insulating a single room to designing an entire building structure with soundproofing in mind.