Abstract: A timber end-joint for end-joining two structural timber segments. The timber end-joint invention is capable of providing stability in axial, lateral, and transverse directions of the joined timber segments, while also concealing the joint such that the appearance of the joined timber segments simulates a single continuous wood timber. The timber end-joint includes generally a tongue, a groove, and a registration device. The tongue extends axially outwardly from the first timber segment. The groove defines a first leg and a second leg protruding axially outwardly from the second timber segment, keyed to receive the tongue. The first leg and the second leg cooperatively define a relief channel positioned transversely along an interface between the first and second legs. The registration device includes a plurality of pegs and peg openings configured along the tongue and groove to provide an aligned fit between the first and second timber segments.