A universal handrail support bracket is disclosed in which a bracket is configured to be mounted to a handrail or banister and the bracket has an annular ring attached thereto. The annular ring has a concave interior surface and a convex exterior surface. A curved nut and a cap have surfaces which mate with respectively the inner and outer surfaces of the annular ring. The curved nut and the cap are positioned respectively inside and upon the annular ring such that they may both freely rotate and pivot. A fastener such as a screw passes through both the curved nut and the cap and into a fixed substantially vertical surface such that the bracket may be attached to the fixed substantially vertical surface at any desired pitch angle, yaw angle, and roll angle for attaching a rail to a vertical surface.