Swimming at the 2018 Summer Youth Olympics – Girls' 100 metre backstroke

The heats were started on 7 October at 10:48.[2]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	3	3	Ryan White	United States	1:00.88	Q
2	2	4	Kaylee McKeown	Australia	1:01.29	Q
3	4	4	Polina Egorova	Russia	1:01.74	Q
4	4	5	Peng Xuwei	China	1:01.78	Q
5	3	5	Madison Broad	Canada	1:01.86	Q
6	3	4	Daria Vaskina	Russia	1:02.05	Q
7	2	3	Tamara Frías	Spain	1:02.13	Q
8	3	7	Ingeborg Løyning	Norway	1:02.50	Q
9	3	2	Gina Galloway	New Zealand	1:02.66	Q
10	3	6	Anastasiya Shkurdai	Belarus	1:02.68	Q
11	2	2	Maria Pessanha	Brazil	1:02.89	Q
12	4	6	Laura Ilyés	Hungary	1:02.97	Q
13	2	5	Mariella Venter	South Africa	1:03.15	Q
14	4	3	Tatiana Salcuțan	Moldova	1:03.16	Q
15	4	2	Fernanda de Goeij	Brazil	1:03.30	Q
16	2	7	Cristina García	Spain	1:03.54	Q
17	4	7	Lila Touili	France	1:03.63
18	3	1	Arina Baikova	Latvia	1:04.01
19	2	1	Diana Nazarova	Kazakhstan	1:04.10
20	4	1	Chen Szu-chi	Chinese Taipei	1:04.17
21	2	6	Maryna Kolesnykova	Ukraine	1:04.27
22	3	8	Andrea Hurtado	Peru	1:04.67
23	4	8	Lucija Šulenta	Croatia	1:05.82
24	1	4	Natalie Kan	Hong Kong	1:06.20
25	2	8	Taydé Sansores	Mexico	1:06.58
26	1	1	Mia Krstevska	Macedonia	1:08.85
	1	3	Robyn Young	Eswatini	DNS

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The semifinals were started on 7 October at 18:30.[3]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	2	5	Polina Egorova	Russia	1:00.92	Q
2	2	4	Ryan White	United States	1:00.94	Q
3	1	3	Daria Vaskina	Russia	1:01.41	Q
4	1	4	Kaylee McKeown	Australia	1:01.51	Q
5	2	3	Madison Broad	Canada	1:01.66	Q
6	1	1	Tatiana Salcuțan	Moldova	1:02.04	Q
7	1	5	Peng Xuwei	China	1:02.12	Q
8	2	6	Tamara Frías	Spain	1:02.17	Q
9	2	8	Fernanda de Goeij	Brazil	1:02.48
10	1	7	Laura Ilyés	Hungary	1:02.90
11	2	7	Maria Pessanha	Brazil	1:03.00
12	1	2	Anastasiya Shkurdai	Belarus	1:03.06
13	1	6	Ingeborg Løyning	Norway	1:03.26
14	1	8	Cristina García	Spain	1:03.39
14	2	2	Gina Galloway	New Zealand	1:03.39
16	2	1	Mariella Venter	South Africa	1:03.53

• 
  Semifinal 1

The final was held on 8 October at 19:06.[4]

Rank	Lane	Name	Nationality	Time	Notes
	3	Daria Vaskina	Russia	1:00.45
	6	Kaylee McKeown	Australia	1:00.58
	5	Ryan White	United States	1:00.60
4	4	Polina Egorova	Russia	1:01.25
5	2	Madison Broad	Canada	1:01.37
6	1	Peng Xuwei	China	1:01.44
7	8	Tamara Frías	Spain	1:01.93
8	7	Tatiana Salcuțan	Moldova	1:02.20