气垫船（英语：Hovercraft）是一种以空气在船只底部衬垫承托的交通工具，其气垫通常是由持续不断供应的低压气体形成。气垫船除了在水上行走外，还可以在某些比较平滑的陆上或者是在结冰的水域等地形行驶。气垫船是高速行驶船只的一种，行驶时因为船身受气压自水面抬升而起，大幅降低船体的流体阻力，以致行驶速度比动力输出接近的一般船只快上许多。很多气垫船的速度都可以超过50节，但与另一种可以高速行驶的船只水翼船不同，由于气垫船的升力并非依靠速度产生，因此纵使以非常缓慢的速度行驶，也不影响其效率。

A hovercraft, also known as an air-cushion vehicle or ACV, is a craft capable of travelling over land, water, mud or ice and other surfaces. Hovercraft are hybrid vessels operated by a pilot as an aircraft rather than a captain as a marine vessel.

Hovercraft use blowers to produce a large volume of air below the hull that is slightly above atmospheric pressure. The pressure difference between the higher pressure air below the hull and lower pressure ambient air above it produces lift, which causes the hull to float above the running surface. For stability reasons, the air is typically blown through slots or holes around the outside of a disk- or oval-shaped platform, giving most hovercraft a characteristic rounded-rectangle shape. Typically this cushion is contained within a flexible "skirt", which allows the vehicle to travel over small obstructions without damage.