A rubber bushing, sometimes simply called a bushing, is a kind of vibration isolator. Its main purpose is to serve as an interface between two parts, acting as a buffer and absorbing some of the energy produced by the interaction of two parts. It separates two parts while allowing a limited amount of movement, thus minimizing vibration and even noise.

Rubber bushings come in a variety of forms. Typically, they are fashioned into an annular cylinder shape and are encased in metal cases or in outer tubes. In other applications, the bushings have an internal crush tube which protects them from being crushed.

The use of rubber bushings is often preferable to solid connections as noise and vibration are lessened. They can also eliminate the use of lubrication between two parts.