Athletics at the 1970 British Commonwealth Games – Women's 400 metres

{{short description|Athletics event}}

{{Use dmy dates|date=April 2022}}

{{Infobox Commonwealth Games event

|event = Women's 400 metres

|games = 1970

|image =

|image_size =

|caption =

|venue = Meadowbank Stadium, Edinburgh

|dates = 22 and 23 July 1970

|competitors =

|nations =

|win_label =

|win_value =

|gold = Marilyn Neufville

|goldCGA = JAM

|silver = Sandra Brown

|silverCGA = AUS

|bronze = Judith Ayaa

|bronzeCGA = UGA

|prev = 1966 Kingston

|next = Christchurch 1974

}}

{{AthleticsAt1970CommonwealthGames}}

The women's 400 metres event at the 1970 British Commonwealth Games was held on 22 and 23 July at the Meadowbank Stadium in Edinburgh, Scotland.{{cite web |title=Results |url=https://thecgf.com/results/games/3037/event/1629 |website=thecgf.com |accessdate=23 September 2019}} It was the first time that the metric distance was contested at the Games, replacing the 440 yards event.

The winning margin was 2.64 seconds which as of 2024 remains the only time the women's 400 metres was won by more than two seconds at these games.