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

A three-way fitting is a type of industrial pipeline component 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 openings, used at junctions where three identical or different pipelines converge. The primary function of a three-way fitting is to alter the flow direction.