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The women's 100 metre backstroke event at the 1964 Olympic Games took place between October 13 and 14.^[1] This swimming event used backstroke. Because an Olympic-size swimming pool is 50 metres long, this race consisted of two lengths of the pool.

Medalists

Gold	Cathy Ferguson United States
Silver	Kiki Caron France
Bronze	Ginny Duenkel United States

Heat 1

Rank	Athlete	Country	Time
1	Nina Harmer	United States	1:09.8
2	Satoko Tanaka	Japan	1:10.0
3	Linda Ludgrove	Great Britain	1:10.3
4	Helga Schmidt-Neuber	Germany	1:11.4
5	Helen Kennedy	Canada	1:12.5
6	Belinda Woosley	Australia	1:15.3
7	Jovina Tseng	Malaysia	1:20.7

Heat 2

Rank	Athlete	Country	Time
1	Ginny Duenkel	United States	1:08.9
2	Eileen Weir	Canada	1:09.7
3	Michiko Kihara	Japan	1:11.1
4	Kirsten Michaelsen	Denmark	1:11.2
5	Tatyana Savelyeva	Soviet Union	1:11.8
6	Mária Balla-Lantos	Hungary	1:12.0
7	Bep Weeteling	Netherlands	1:13.1
8	Ursula Seitz	Austria	1:13.3

Heat 3

Rank	Athlete	Country	Time
1	Cathy Ferguson	United States	1:08.8
2	Françoise Borie	France	1:11.8
3	Petra Nerger	Germany	1:12.1
4	Sylvia Lewis	Great Britain	1:12.2
5	Ria van Velsen	Netherlands	1:12.2
6	Marlene Dayman	Australia	1:12.9
7	Anneliese Rockenbach	Venezuela	1:14.1
8	Margaret Harding	Puerto Rico	1:19.5

Heat 4

Rank	Athlete	Country	Time
1	Kiki Caron	France	1:08.5
2	Jill Norfolk	Great Britain	1:10.6
3	Ingrid Schmidt	Germany	1:11.1
4	Nataliya Mikhaylova	Soviet Union	1:11.4
5	Corrie Winkel	Netherlands	1:11.6
6	Nanette Duncan	Australia	1:12.4
7	Susana Peper	Argentina	1:13.2
8	Jeon Ok-ja	South Korea	1:21.7

Rank	Athlete	Country	Time	Notes
	Cathy Ferguson	United States	1:07.7	WR
	Kiki Caron	France	1:07.9
	Ginny Duenkel	United States	1:08.0
4	Satoko Tanaka	Japan	1:08.6
5	Nina Harmer	United States	1:09.4
6	Linda Ludgrove	Great Britain	1:09.5
7	Eileen Weir	Canada	1:09.8
8	Jill Norfolk	Great Britain	1:11.2

Key: WR = World record