Three-way connectors are used for pipe fittings and pipe connections. Also known as pipe fitting three-way or three-way pipe fittings, three-way joints, they are used where the main pipeline needs to branch off.

A three-way is a type of industrial pipe fitting with three openings: one inlet and two outlets; or two inlets and one outlet. It comes in T and Y configurations, with both equal and unequal diameter outlets, used at junctions where three pipes, either the same or different, converge. The primary function of a three-way is to alter the direction of the fluid.