Three-way connectors are pipe fittings and pipeline connectors. Also known as three-way pipe fittings or three-way connectors, they are used at the branching point of the main pipeline.

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