Athletics at the 1964 Summer Olympics – Women's 400 metres
The women's 400 metres was the second-longest of the four women's track races in the Athletics at the 1964 Summer Olympics program in Tokyo. It was held on 15 October, 16 October, and 17 October 1964. 23 athletes from 17 nations entered. The first round was held on 15 October, the semifinals on 16 October, and the final on 17 October. The 1964 Summer Olympics were the first to feature the women's 400 metres.Results
First round
The top five runners in each of the 3 heats advanced, as well as the next fastest runner from across the heats.First round, heat 1
| Place | Athlete | Nation | Time |
| 1 | Antónia Munkácsi | | 54.4 seconds OR |
| 2 | Tilly van der Made | | 54.8 seconds |
| 3 | Betty Cuthbert | | 56.0 seconds |
| 4 | Joy Grieveson | | 56.8 seconds |
| 5 | Kiyoki Ogawa | | 57.6 seconds |
| 6 | Stephie D'Souza | | 58.0 seconds |
| 7 | Erna Maisack | | 58.6 seconds |
| 8 | Ramazangiin Aldaa-nysh | | 1:00.8 |
First round, heat 2
| Place | Athlete | Nation | Time |
| 1 | Maria Itkina | | 54.9 seconds |
| 2 | Margret Buscher | | 55.3 seconds |
| 3 | Una Morris | | 55.3 seconds |
| 4 | Maeve Kyle | | 55.4 seconds |
| 5 | Janell Smith | | 55.5 seconds |
| 6 | Patricia Kippax | | 55.5 seconds |
| 7 | Abigal Hoffman | | 55.9 seconds |
| 8 | Samruay Charonggool | | 1:04.0 |
First round, heat 3
| Place | Athlete | Nation | Time |
| 1 | Ann Packer | | 53.1 seconds OR |
| 2 | Judy Amoore | | 53.8 seconds |
| 3 | Evelyne Lebret | | 54.8 seconds |
| 4 | Gertrud Schmidt | | 55.1 seconds |
| 5 | Olga Kazi | | 56.5 seconds |
| 6 | Mary Rajamani | | 57.8 seconds |
| 7 | Han Myeong-hui | | 58.7 seconds |
Semifinals
The fastest four runners in each of the two semifinals advanced to the final.Semifinal 1
| Place | Athlete | Nation | Time |
| 1 | Ann Packer | | 52.7 seconds OR |
| 2 | Betty Cuthbert | | 53.8 seconds |
| 3 | Antónia Munkácsi | | 54.0 seconds |
| 4 | Evelyne Lebret | | 54.5 seconds |
| 5 | Joy Grieveson | | 54.8 seconds |
| 6 | Una Morris | | 54.9 seconds |
| 7 | Margret Buscher | | 55.2 seconds |
| 8 | Ogawa Kiyoko | | 57.1 seconds |
Semifinal 2
| Place | Athlete | Nation | Time |
| 1 | Judy Amoore | | 53.3 seconds |
| 2 | Maria Itkina | | 53.5 seconds |
| 3 | Tilly van der Made | | 54.1 seconds |
| 4 | Gertrud Schmidt | | 54.2 seconds |
| 5 | Patricia Kippax | | 54.4 seconds |
| 6 | Janell Smith | | 54.5 seconds |
| 7 | Maeve Kyle | | 55.3 seconds |
| — | Olga Kazi | | Did not start |
Final
| Place | Athlete | Nation | Time |
| 1 | Betty Cuthbert | | 52.0 seconds OR |
| 2 | Ann Packer | | 52.2 seconds |
| 3 | Judy Amoore | | 53.4 seconds |
| 4 | Antónia Munkácsi | | 54.4 seconds |
| 5 | Maria Itkina | | 54.6 seconds |
| 6 | Tilly van der Made | | 55.2 seconds |
| 7 | Gertrud Schmidt | | 55.4 seconds |
| 8 | Evelyne Lebret | | 55.5 seconds |
