The Women's 100 metre butterfly competition of the 2018 FINA World Swimming Championships (25 m) was held on 15 and 16 December 2018 at the Hangzhou Olympic Sports Center.

Records Prior to the competition, the existing world and championship records were as follows. Name Nation Time Location DateWorld recordChampionship recordSarah Sjöström54.61Doha7 December 2014

Results

Heats The heats were started on 15 December at 10:22.Heats results Rank Heat Lane Name Nationality Time Notes 1 5 4 Kelsi Dahlia 55.46 Q 2 4 6 Ai Soma 56.52 Q 3 5 2 Kendyl Stewart 56.57 Q 4 3 3 Elena Di Liddo 56.62 Q 5 3 5 Daiene Dias 56.78 Q 6 5 5 Ilaria Bianchi 56.85 Q 7 5 9 Haley Black 57.10 Q 8 5 6 Wang Yichun 57.12 Q 9 4 4 Zhang Yufei 57.21 Q 10 4 5 Aliena Schmidtke 57.23 Q 11 3 4 Svetlana Chimrova 57.36 Q 12 3 6 Yukina Hirayama 57.59 Q 13 3 2 Anna Ntountounaki 57.64 Q 14 4 3 Kim Busch 57.76 Q 15 4 7 Anastasiya Shkurdai 58.10 Q 16 5 8 Park Ye-rin 58.22 Q 17 3 7 Emilie Løvberg 58.24 18 5 7 Erin Gallagher 58.29 19 4 1 Alexandra Touretski 58.34 20 4 0 Amina Kajtaz 58.78 21 4 2 Daria Kartashova 58.86 22 5 1 Chan Kin Lok 58.89 23 3 1 Lucie Svěcená 59.00 24 5 0 Ana Monteiro 59.27 25 3 0 Isabella Páez 59.69 26 3 8 Nida Eliz Üstündağ 59.79 27 4 8 Nicholle Toh 28 2 5 Celina Márquez 29 4 9 Vanessa Ouwehand 30 2 3 Elodie Poo-cheong 31 2 4 Beatriz Padrón 32 3 9 Alexandra Schegoleva 33 1 6 Huang Mei-chien 34 2 6 Alsu Bayramova 35 2 2 Hiba Doueihy 36 2 7 Imara-Bella Thorpe 37 1 1 Karla Abarca 38 1 7 Bisma Khan 39 2 1 Michell Ramirez 40 1 2 Dirngulbai Misech 40 2 8 Lara Aklouk 42 1 4 Avice Meya NR 43 2 9 Mineri Kurotori Gomez 44 2 0 Celina Itatiro 45 1 5 Aishath Sausan 1 3 Lucie Kouadio-Patinier 5 3 Katinka Hosszú

Semifinals The semifinals were held at 19:31.

Semifinal 1 Rank Lane Name Nationality Time Notes 1 5 Elena di Liddo 56.06 Q 2 4 Ai Soma 56.31 Q 3 3 Ilaria Bianchi 56.79 Q 4 6 Wang Yichun 56.80 Q 5 7 Yukina Hirayama 57.10 R 6 2 Aliena Schmidtke 57.27 7 1 Kim Busch 57.63 8 8 Park Ye-rin 58.21

Semifinal 2 Rank Lane Name Nationality Time Notes 1 4 Kelsi Dahlia 55.09 Q 2 3 Daiene Dias 56.40 Q, SA 3 5 Kendyl Stewart 56.62 Q 4 2 Zhang Yufei 56.77 Q 5 6 Haley Black 56.91 R 6 8 Anastasiya Shkurdai 57.20 7 1 Anna Ntountounaki 57.42 8 7 Svetlana Chimrova 57.48

Final The final was held at 19:08.

Rank Lane Name Nationality Time Notes 4 Kelsi Dahlia 55.01 2 Kendyl Stewart 56.22 6 Daiene Dias 56.31 SA 4 7 Ilaria Bianchi 56.39 5 5 Elena di Liddo 56.50 6 8 Haley Black 56.72 7 3 Ai Soma 56.76 8 1 Wang Yichun 56.96

References