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 at the 1984 Summer Olympics in Los Angeles, California had an entry list of 76 competitors, with ten qualifying heats (76), four quarterfinals (32) and two semi-finals (16), before the final (7) took off. At the 1984 Summer Olympics in Los Angeles, 41 events in athletics were contested, 24 events by men and 17 by women. There were a total number of 1273 participating athletes from 124 countries.