Peter Dickson Pfitzinger (born August 29, 1957 in Camden, New Jersey) is an American former distance runner, who later became an author and exercise physiologist. He is best known for his accomplishments in the marathon, an event in which he represented the United States in two Summer Olympic Games: the Los Angeles Olympics (where Pfitzinger finished 11th) and the 1988 Seoul Olympics (where he placed 14th).