Piping is a trim or edging formed by sewing a thin strip of folded fabric — typically bias binding — into a narrow tube and attaching it to the edge of a piece of fabric. It can also include cord to give it extra body. Piping is often used to define or reinforce the style lines of a garment.

Within industry, piping is a system of pipes used to convey fluids (liquids and gases) from one location to another. The engineering discipline of piping design studies the efficient transport of fluid.