Three-way connectors are used for pipe fittings and pipe connections. Also known as pipe fitting three-way or three-way pipe fitting, three-way joint, used where the main pipe 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 identical or different pipelines converge. The primary function of a three-way is to alter the fluid direction.