Athletics at the 1908 Summer Olympics – Men's 400 metres
The men's 400 metres was an Olympic event for the fourth time at the 1908 Summer Olympics in London. The competition was held from July 21, 1908, to July 23, 1908. The rerun of the final was held on July 25, 1908. The races were held on a track of 536.45 metres= mile in circumference.