Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The men's decathlon was part of the Athletics at the 1964 Summer Olympics program in Tokyo. It was held on 19 October and 20 October 1964, with five events each day. 23 athletes from 15 nations entered, with 1 not starting the first event. At the 1964 Summer Olympics in Tokyo, the athletics competition included 36 events, 24 for men and 12 for women. The women's 400 metres and women's pentathlon events were newly introduced at these Games. There were a total number of 1016 participating athletes from 82 countries.