Abstract: An adapter for interfacing a bipolar electrosurgical instrument to a monopolar electrosurgical generator comprises a pair of connectors, one having a single monopolar contact and the other having a pair of bipolar contacts is disposed between the active output terminal of the monopolar electrosurgical generator and the bipolar electrosurgical instrument. The adapter is configured to electrically connect the bipolar contacts at one end of the adapter in common with the monopolar contact at the other end. In accordance with a further embodiment, an electrical switch is provided on the electrosurgical instrument to selectively connecting both electrodes of the bipolar electrosurgical instrument to a single monopolar contact design to make with the monopolar electrosurgical generator.