title: Athletics at the 1984 Summer Olympics – Women's 400 metres
text: # Athletics at the 1984 Summer Olympics – Women's 400 metres
  
  These are the official results of the Women's 400 metres event at the 1984 Summer Olympics in Los Angeles, California. The final was held on August 6, 1984.
  
  ## Final
  
  Held on August 6, 1984
  
  | Rank | Athlete | Nation | Time |
  | - | - | - | - |
  | | Valerie Brisco-Hooks | United States | 48.83 (OR) |
  | | Chandra Cheeseborough | United States | 49.05 |
  | | Kathy Cook | Great Britain | 49.43 |
  | 4 | Marita Payne | Canada | 49.91 |
  | 5 | Lillie Leatherwood | United States | 50.25 |
  | 6 | Ute Thimm | West Germany | 50.37 |
  | 7 | Charmaine Crooks | Canada | 50.45 |
  | 8 | Ruth Waithera | Kenya | 51.56 |
  
  ## Semifinals
  
  * Held on August 5, 1984
  
  | Rank | Athlete | Nation | Time |
  | - | - | - | - |
  | 1 | Valerie Brisco-Hooks | United States | 51.14 |
  | 2 | Kathy Cook | Great Britain | 51.49 |
  | 3 | Charmaine Crooks | Canada | 51.53 |
  | 4 | Ruth Waithera | Kenya | 52.21 |
  | 5 | June Griffith | Guyana | 52.39 |
  | 6 | Cathy Rattray-Williams | Jamaica | 53.23 |
  | 7 | Marie Mathieu | Puerto Rico | 53.69 |
  | – | Gaby Bußmann | West Germany | DNS |
  | Rank | Athlete | Nation | Time |
  | 1 | Chandra Cheeseborough | United States | 50.32 |
  | 2 | Lillie Leatherwood | United States | 50.83 |
  | 3 | Marita Payne | Canada | 50.94 |
  | 4 | Ute Thimm | West Germany | 51.03 |
  | 5 | Molly Killingbeck | Canada | 51.72 |
  | 6 | Michelle Scutt | Great Britain | 52.07 |
  | 7 | Ilrey Oliver | Jamaica | 52.14 |
  | 8 | Helen Barnett | Great Britain | 52.26 |
  
  ## Round one
  
  * Held on August 4, 1984
  
  | Rank | Athlete | Nation | Time |
  | - | - | - | - |
  | 1 | Chandra Cheeseborough | United States | 50.94 |
  | 2 | Charmaine Crooks | Canada | 52.04 |
  | 3 | Ilrey Oliver | Jamaica | 52.19 |
  | 4 | June Griffith | Guyana | 52.27 |
  | 5 | Heike Schulte-Mattler | West Germany | 52.77 |
  | 6 | Erica Rossi | Italy | 53.04 |
  | 7 | Jocelyn Joseph | Antigua and Barbuda | 53.63 |
  | 8 | Zonia Meigham | Guatemala | 55.64 |
  | Rank | Athlete | Nation | Time |
  | 1 | Gaby Bußmann | West Germany | 52.42 |
  | 2 | Kathy Cook | Great Britain | 52.64 |
  | 3 | Molly Killingbeck | Canada | 52.77 |
  | 4 | Cathy Rattray-Williams | Jamaica | 52.78 |
  | 5 | Gail Emmanuel | Trinidad and Tobago | 54.07 |
  | 6 | Elanga Buala | Papua New Guinea | 56.82 |
  | 7 | Mercy Addy | Ghana | 58.91 |
  | Rank | Athlete | Nation | Time |
  | 1 | Lillie Leatherwood | United States | 52.05 |
  | 2 | Marita Payne | Canada | 52.89 |
  | 3 | Helen Barnett | Great Britain | 52.94 |
  | 4 | Marie Mathieu | Puerto Rico | 53.27 |
  | 5 | Emma Tahapari | Indonesia | 55.82 |
  | 6 | Reawadee Srithoa | Thailand | 58.11 |
  | Rank | Athlete | Nation | Time |
  | 1 | Valerie Brisco-Hooks | United States | 51.42 |
  | 2 | Ruth Waithera | Kenya | 52.53 |
  | 3 | Ute Thimm | West Germany | 52.53 |
  | 4 | Michelle Scutt | Great Britain | 52.89 |
  | 5 | Cynthia Green | Jamaica | 53.61 |
  | 6 | Carlon Blackman | Barbados | 54.26 |
  | 7 | Mina El-Jas Zeina | Lebanon | 59.56 |
  