Donald Mark Sibley (born (1950-11-13)November 13, 1950) is a retired American basketball player. He was a 6'2" 175 lb guard and attended Northwestern University. He was selected in the fourth round of the 1973 NBA Draft by the Chicago Bulls but was waived prior to the start of the 1973-74 season. He was the only rookie of 17 in Bulls camp to have graduated from college. He played one year for the Portland Trail Blazers, followed by one year of basketball for a team in Brugges, Belgium. He returned to Northwestern University to earn a Masters of Art of Teaching degree which led to a 33 year career of teaching English and coaching basketball and soccer at York High School in Elmhurst.