Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The men's 400 metres was a track and field athletics event held as part of the Athletics at the 1912 Summer Olympics programme. It was the fifth appearance of the event, which is one of 12 athletics events to have been held at every Summer Olympics. The competition was held on Friday, July 12, 1912 and on Saturday, July 13, 1912. Forty-nine runners from 16 nations competed. The Olympic record of 48.4 seconds, set at the previous Olympics, fell in the final. Charles Reidpath broke the record with a 48.2 second performance. Hanns Braun also broke the old record and Edward Lindberg tied it, en route to silver and bronze medals, respectively.