Donald Dell (born June 17, 1938 in Bethesda, Maryland, USA) is an attorney and was a professional tennis player, U.S. Davis Cup captain, and administrator. Dell was one of the first professional sports agents, having represented professional tennis players Arthur Ashe, Stan Smith, Jimmy Connors, and Ivan Lendl during pro tennis' golden age (1975 to 1985). He was also the founder of Professional Services (ProServ), one of the nation's first sports marketing firms established in 1970 with co-founder, Frank Craighill, a fellow law partner. His younger brother, Dick, worked for ProServ managing US Open champion Gabriela Sabatini, and played Number One Singles for the University of Michigan. He was Big Ten #1 Singles Champion in 1969.