Swimming at the 2013 World Aquatics Championships – Men's 100 metre butterfly
The men's 100 metre butterfly event in swimming at the 2013 World Aquatics Championships took place on 2–3 August at the Palau Sant Jordi in Barcelona, Spain.Records
Prior to this competition, the existing world and championship records were:Results
Heats
The heats were held at 10:39.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 4 | Yevgeny Korotyshkin | | 51.55 | Q |
| 2 | 5 | 4 | Chad le Clos | | 51.88 | Q |
| 3 | 6 | 8 | László Cseh | | 51.89 | Q |
| 4 | 5 | 7 | Ivan Lenđer | | 51.95 | Q |
| 5 | 5 | 5 | Matteo Rivolta | | 52.00 | Q |
| 6 | 4 | 6 | Yauhen Tsurkin | | 52.03 | Q, NR |
| 7 | 6 | 4 | Steffen Deibler | | 52.07 | Q |
| 8 | 5 | 6 | Nikolay Skvortsov | | 52.09 | Q |
| 9 | 5 | 3 | Konrad Czerniak | | 52.12 | Q |
| 10 | 6 | 6 | Michael Rock | | 52.13 | Q |
| 11 | 4 | 3 | Paweł Korzeniowski | | 52.16 | Q |
| 12 | 5 | 0 | Thiago Pereira | | 52.23 | Q |
| 13 | 4 | 5 | Ryan Lochte | | 52.26 | Q |
| 14 | 6 | 5 | Eugene Godsoe | | 52.38 | Q |
| 15 | 5 | 2 | Takuro Fujii | | 52.50 | Q |
| 16 | 6 | 7 | Philip Heintz | | 52.52 | Q |
| 17 | 4 | 7 | Joseph Schooling | | 52.56 | |
| 18 | 5 | 8 | Francois Heersbrandt | | 52.75 | |
| 19 | 4 | 2 | Tommaso D'Orsogna | | 52.82 | |
| 20 | 6 | 3 | Chris Wright | | 52.83 | |
| 21 | 5 | 1 | Pavel Sankovich | | 52.87 | |
| 22 | 3 | 6 | Mario Todorović | | 52.92 | |
| 23 | 4 | 8 | Rafael Muñoz | | 52.94 | |
| 24 | 6 | 2 | Bence Pulai | | 52.98 | |
| 25 | 6 | 1 | Yuki Kobori | | 53.11 | |
| 25 | 6 | 0 | Mauricio Fiol | | 53.11 | |
| 27 | 6 | 9 | Benjamin Hockin | | 53.28 | |
| 28 | 3 | 5 | Alexandru Coci | | 53.34 | |
| 29 | 3 | 3 | Coleman Allen | | 53.53 | |
| 30 | 4 | 1 | Mehdy Metella | | 53.77 | |
| 31 | 5 | 9 | Simao Morgado | | 53.83 | |
| 32 | 3 | 4 | Dominik Meichtry | | 53.96 | |
| 33 | 3 | 2 | Tadas Duskinas | | 53.97 | |
| 34 | 4 | 0 | Chang Gyu-Cheol | | 54.09 | |
| 35 | 3 | 7 | Yevgeniy Lazuka | | 54.29 | |
| 36 | 3 | 1 | Liu Weijia | | 54.37 | |
| 37 | 3 | 9 | Marwan Adel | | 54.39 | |
| 38 | 3 | 0 | Martin Zikmund | | 54.63 | |
| 39 | 2 | 7 | Ricardo Yee | | 55.82 | |
| 40 | 2 | 1 | Jessie Lacuna | | 55.92 | |
| 41 | 2 | 6 | Joshua McLeod | | 56.06 | |
| 42 | 2 | 2 | Tyrone Alvarado | | 56.27 | |
| 43 | 2 | 3 | Ifalemi Sau-Paea | | 56.32 | |
| 44 | 2 | 4 | Alexandre Bakhtiarov | | 56.38 | |
| 45 | 3 | 8 | Yousef Al-Askari | | 56.40 | |
| 46 | 1 | 6 | Anthony Ralefy | | 56.48 | |
| 46 | 2 | 5 | Ayman Klzie | | 56.48 | |
| 48 | 1 | 4 | Christopher Clark | | 56.50 | |
| 49 | 1 | 3 | Ralph Goveia | | 57.66 | |
| 50 | 2 | 0 | Sofyan El Gadi | | 57.79 | |
| 51 | 2 | 8 | Afshin Asgari | | 59.29 | |
| 52 | 2 | 9 | Ameer Ali | | 59.81 | |
| 53 | 1 | 2 | Oumar Toure | | 59.86 | |
| 54 | 1 | 1 | Stanford Kawale | | | |
| 55 | 1 | 7 | Kensuke Kimura | | | |
| 56 | 1 | 9 | Sylla Alassane | | | |
| 57 | 1 | 8 | Haris Bandey | | | |
| 1 | 0 | Abdulrahman Al-Ishaq | | | |
| 1 | 5 | Nuno Miguel Rola | | | |
| 4 | 9 | Simon Sjödin | | | |
Semifinals
The semifinals were held at 19:04.Semifinal 1
Semifinal 2
Final
The final was held at 18:43.
| Rank | Lane | Name | Nationality | Time | Notes |
| 5 | Chad le Clos | | 51.06 | NR |
| 2 | László Cseh | | 51.45 | NR |
| 3 | Konrad Czerniak | | 51.46 | |
| 4 | 1 | Steffen Deibler | | 51.54 | |
| 5 | 6 | Yevgeny Korotyshkin | | 51.57 | |
| 6 | 4 | Ryan Lochte | | 51.58 | |
| 7 | 7 | Matteo Rivolta | | 51.65 | |
| 7 | 8 | Yauhen Tsurkin | | 51.65 | NR |
