Abstract: The kayaking harness provides a kayaker with support for his back during extended boating sessions. The harness has a back support structure and a tether for attaching the back support structure to the kayak. The back support structure has a torso band having a first end and a second end, the torso band encircling the trunk of the body, a pair of shoulders straps, each shoulder strap having a first end attached to the torso band and a free second end, and a support band attached between the shoulder straps parallel to the torso band. The tether has a loop at one end, the two ends of the torso band and the free ends of the shoulder straps being attached to the loop, and an attachment mechanism at the other end for attaching the tether to the kayak, at least part of the tether having an elastic strap in parallel with nylon webbing so that the tether is resilient and extensible to the length of the webbing.