The men's 300 m rifle three positions was one of 15 events on the shooting at the 1908 Summer Olympics programme. The competition was held on Saturday, 11 July 1908. Each nation could enter up to 12 shooters. Fifty-one sport shooters from ten nations competed. The event was won by Albert Helgerud of Norway, the nation's first victory in the event (after a bronze in 1900). Norway also won bronze, with Ole Sæther finishing third. Between the two Norwegians was Harry Simon, taking silver in the United States' debut.