John Greenwood is a former NASCAR driver from Troy, MI. He competed in two Nextel Cup Series events in his career. Both races came in 1980, when Greenwood debuted at Charlotte. Starting 33rd in the forty-two car field, Greenwood completed just a few laps before crashing to 40th. He was able to improve significantly in his other event, driving to a solid 21st place showing at Daytona.