An electrical connector includes a circuit board having an internal ground plane that defines at least a portion of an internal layer of the circuit board. The circuit board has an exterior side that includes a mounting region and includes electrical contacts arranged on the exterior side within the mounting region for making electrical connection with corresponding signal conductors of electrical wires. Ground shields are mounted to the mounting region of the circuit board and include electrically conductive bodies that are configured to extend over corresponding electrical wires along the mounting region of the circuit board. The bodies of the ground shields include side segments that are configured to extend between the signal conductors of adjacent electrical wires along the mounting region of the circuit board. The bodies are engaged with the internal ground plane of the circuit board to electrically connect the ground shields to the internal ground plane.