Three-way connectors are pipe fittings and pipeline connectors. Also known as pipe fitting three-way or three-way pipe fitting, three-way joint, used where the main pipeline branches off.

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