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

A three-way is a type of industrial pipeline fitting with three openings: one inlet and two outlets; or two inlets and one outlet. It comes in T and Y shapes, 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 flow.