Swimming at the 2019 World Aquatics Championships – Men's 100 metre breaststroke
The Men's 100 metre breaststroke competition at the 2019 World Championships was held on 21 and 22 July 2019. Adam Peaty broke the world record with a time of 56.88 in the semi-final, the first man to swim under 57 seconds in this event, and went on to win in the final.Records
Prior to the competition, the existing world and championship records were as follows.
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 21 July | [|Semifinal] | Adam Peaty | | 56.88 | , CR |
Results
Heats
The heats were held on 21 July at 11:54.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 9 | 4 | Adam Peaty | | | Q |
| 2 | 8 | 4 | Ilya Shymanovich | | | Q |
| 3 | 9 | 5 | Yasuhiro Koseki | | | Q |
| 4 | 8 | 5 | Yan Zibei | | | Q |
| 5 | 7 | 4 | James Wilby | | | Q |
| 6 | 9 | 1 | Matthew Wilson | | | Q |
| 7 | 9 | 7 | João Gomes Júnior | | | Q |
| 8 | 9 | 6 | Andrew Wilson | | | Q |
| 9 | 9 | 3 | Anton Chupkov | | | Q |
| 10 | 8 | 6 | Kirill Prigoda | | | Q |
| 11 | 8 | 3 | Arno Kamminga | | | Q |
| 12 | 8 | 1 | Wang Lizhuo | | | Q |
| 13 | 8 | 2 | Dmitriy Balandin | | | Q |
| 14 | 7 | 6 | Nicolò Martinenghi | | | Q |
| 15 | 7 | 5 | Fabio Scozzoli | | | Q |
| 16 | 7 | 7 | Andrius Šidlauskas | | | Q |
| 17 | 8 | 8 | Darragh Greene | | | NR |
| 18 | 8 | 7 | Felipe Lima | | 1:00.00 | |
| 19 | 9 | 2 | Michael Andrew | | 1:00.04 | |
| 20 | 7 | 1 | Fabian Schwingenschlögl | | 1:00.12 | |
| 21 | 9 | 8 | Giedrius Titenis | | 1:00.20 | |
| 22 | 7 | 2 | Berkay-Ömer Öğretir | | 1:00.26 | |
| 23 | 7 | 3 | Tobias Bjerg | | 1:00.29 | |
| 24 | 7 | 0 | Anton Sveinn McKee | | 1:00.32 | NR |
| 25 | 7 | 9 | Martin Allikvee | | 1:00.60 | |
| 26 | 8 | 9 | Erik Persson | | 1:00.66 | |
| 27 | 8 | 0 | Richard Funk | | 1:00.73 | |
| 28 | 5 | 2 | Denis Petrashov | | 1:00.94 | NR |
| 29 | 6 | 8 | Nikola Obrovac | | 1:01.18 | NR |
| 29 | 9 | 0 | Michael Houlie | | 1:01.18 | |
| 31 | 6 | 6 | Youssef El-Kamash | | 1:01.24 | |
| 31 | 7 | 8 | Moon Jae-kwon | | 1:01.24 | |
| 33 | 9 | 9 | Jorge Murillo | | 1:01.45 | |
| 34 | 6 | 9 | Jan Kałusowski | | 1:01.49 | |
| 35 | 6 | 4 | Tomáš Klobučník | | 1:01.65 | |
| 36 | 6 | 5 | Valentin Bayer | | 1:01.68 | |
| 37 | 5 | 6 | Itay Goldfaden | | 1:01.69 | |
| 38 | 6 | 2 | Yannick Käser | | 1:01.85 | |
| 39 | 5 | 3 | Peter John Stevens | | 1:01.90 | |
| 40 | 5 | 0 | Lyubomir Epitropov | | 1:02.04 | |
| 41 | 5 | 9 | Chao Man Hou | | 1:02.14 | NR |
| 42 | 6 | 7 | Chen Chih-ming | | 1:02.18 | |
| 43 | 4 | 5 | Martin Melconian | | 1:02.21 | NR |
| 44 | 5 | 5 | Renato Prono | | 1:02.28 | |
| 45 | 5 | 1 | Miguel Chávez | | 1:02.37 | |
| 46 | 6 | 0 | Dávid Horváth | | 1:02.38 | |
| 47 | 6 | 3 | Vladislav Mustafin | | 1:02.48 | |
| 48 | 5 | 4 | Édgar Crespo | | 1:02.62 | |
| 49 | 5 | 7 | Lionel Khoo | | 1:02.66 | |
| 50 | 4 | 6 | Amro Al-Wir | | 1:02.75 | NR |
| 51 | 4 | 4 | James Deiparine | | 1:02.84 | |
| 52 | 5 | 8 | S.P. Likhith | | 1:02.90 | |
| 53 | 4 | 9 | Adriel Sanes | | 1:02.91 | NR |
| 54 | 4 | 3 | Taichi Vakasama | | 1:03.18 | |
| 55 | 4 | 7 | Daniils Bobrovs | | 1:03.32 | |
| 56 | 6 | 1 | Mykyta Koptyelov | | 1:03.47 | |
| 57 | 4 | 8 | Julio Horrego | | 1:03.55 | |
| 58 | 4 | 2 | Izaak Bastian | | 1:03.60 | |
| 59 | 4 | 0 | Sebastien Kouma | | 1:04.03 | |
| 60 | 3 | 3 | Adrian Robinson | | 1:04.26 | NR |
| 61 | 1 | 7 | Benjamin Schulte | | 1:04.40 | |
| 62 | 3 | 8 | Ryan Maskelyne | | 1:04.44 | |
| 63 | 4 | 1 | Fausto Huerta | | 1:04.65 | |
| 64 | 3 | 4 | Yu Hin Michael Ng | | 1:04.66 | |
| 65 | 3 | 6 | Tasi Limtiaco | | 1:05.10 | |
| 66 | 3 | 7 | Ronan Wantenaar | | 1:05.17 | |
| 67 | 3 | 9 | Micah Masei | | 1:05.24 | |
| 68 | 3 | 1 | Liam Davis | | 1:05.39 | |
| 69 | 3 | 0 | Giacomo Casadei | | 1:05.96 | NR |
| 70 | 1 | 2 | Rashed Al-Tarmoom | | 1:06.35 | |
| 71 | 2 | 2 | Rainier Rafaela | | 1:06.41 | |
| 72 | 3 | 2 | Arnoldo Herrera | | 1:06.42 | |
| 73 | 3 | 5 | Santiago Cavanagh | | 1:06.44 | |
| 74 | 1 | 1 | Muhammad Isa Ahmad | | 1:06.51 | |
| 75 | 1 | 6 | Jonathan Raharvel | | 1:06.53 | |
| 76 | 2 | 6 | Malcolm Richardson | | 1:06.64 | |
| 77 | 2 | 5 | Filipe Gomes | | 1:07.51 | |
| 78 | 2 | 4 | Mohammad Islam | | 1:07.74 | |
| 79 | 2 | 3 | Günsennorovyn Zandanbal | | 1:07.92 | |
| 80 | 2 | 1 | Alex Joachim | | 1:08.14 | |
| 81 | 1 | 5 | Amini Fonua | | 1:08.32 | |
| 82 | 2 | 7 | Abobakr Abass | | 1:09.34 | |
| 83 | 2 | 0 | Kumaren Naidu | | 1:10.13 | |
| 84 | 2 | 8 | Shuvam Shrestha | | 1:11.74 | |
| 85 | 1 | 3 | Yaya Yeressa | | 1:19.66 | |
| 86 | 1 | 4 | Lennosuke Suzuki | | 1:20.97 | |
| 87 | 2 | 9 | Gildas Koumondji | | 1:26.57 | |
Semifinals
The semifinals were held on 21 July at 20:51.Semifinal 1
Semifinal 2
Final
The final was held on 22 July at 20:02.
| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Adam Peaty | | 57.14 | |
| 3 | James Wilby | | 58.46 | |
| 5 | Yan Zibei | | 58.63 | AS |
| 4 | 6 | Yasuhiro Koseki | | 58.93 | |
| 5 | 8 | Kirill Prigoda | | 59.09 | |
| 6 | 2 | Andrew Wilson | | 59.11 | |
| 7 | 7 | Dmitriy Balandin | | 59.14 | |
| 8 | 1 | Anton Chupkov | | 59.19 | |
