# Swimming at the 2015 World Aquatics Championships – Men's 100 metre butterfly

The Men's 100 metre butterfly competition of the swimming events at the 2015 World Aquatics Championships was held on 7 August with the heats and the semifinals and 8 August with the final.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Michael Phelps (USA) | 49.82 | Rome, Italy | 1 August 2009 |
| Competition record | Michael Phelps (USA) | 49.82 | Rome, Italy | 1 August 2009 |

## Results
### Heats

The heats were held at 10:09
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 6 | László Cseh | Hungary | 50.91 | Q, NR |
| 2 | 7 | 4 | Tom Shields | United States | 51.09 | Q |
| 3 | 7 | 7 | Li Zhuhao | China | 51.54 | Q, WJ |
| 4 | 6 | 4 | Konrad Czerniak | Poland | 51.58 | Q |
| 5 | 8 | 6 | Joseph Schooling | Singapore | 51.65 | Q, NR |
| 6 | 7 | 2 | Takuro Fujii | Japan | 51.76 | Q |
| 7 | 7 | 6 | Paweł Korzeniowski | Poland | 51.79 | Q |
| 8 | 8 | 4 | Chad le Clos | South Africa | 51.83 | Q |
| 9 | 7 | 1 | Matteo Rivolta | Italy | 51.88 | Q |
| 10 | 7 | 5 | Tim Phillips | United States | 51.90 | Q |
| 10 | 8 | 7 | Steffen Deibler | Germany | 51.90 | Q |
| 12 | 6 | 3 | Piero Codia | Italy | 51.94 | Q |
| 13 | 8 | 2 | Mehdy Metella | France | 52.07 | Q |
| 14 | 7 | 3 | Jayden Hadler | Australia | 52.17 | Q |
| 15 | 8 | 1 | Tommaso D'Orsogna | Australia | 52.22 | Q |
| 16 | 6 | 5 | Pavel Sankovich | Belarus | 52.29 | Q |
| 17 | 6 | 2 | Adam Barrett | Great Britain | 52.33 | |
| 18 | 5 | 2 | Santiago Grassi | Argentina | 52.36 | |
| 19 | 6 | 8 | Thomas Laxton | Great Britain | 52.37 | |
| 20 | 8 | 8 | Evgeny Koptelov | Russia | 52.38 | |
| 21 | 6 | 7 | Takeshi Kawamoto | Japan | 52.45 | |
| 22 | 8 | 3 | Vyacheslav Prudnikov | Russia | 52.47 | |
| 23 | 7 | 9 | Viktor Bromer | Denmark | 52.53 | |
| 24 | 7 | 8 | Arthur Mendes | Brazil | 52.55 | |
| 25 | 6 | 9 | Luis Martínez | Guatemala | 52.72 | |
| 26 | 8 | 5 | Yauhen Tsurkin | Belarus | 52.73 | |
| 27 | 5 | 4 | Alexandru Coci | Romania | 52.89 | |
| 27 | 5 | 5 | Andreas Vazaios | Greece | 52.89 | |
| 29 | 5 | 1 | Nico van Duijn | Switzerland | 52.94 | |
| 30 | 5 | 7 | Ryan Pini | Papua New Guinea | 53.02 | |
| 31 | 8 | 9 | Ivan Lenđer | Serbia | 53.04 | |
| 32 | 3 | 6 | Robert Žbogar | Slovenia | 53.10 | |
| 33 | 5 | 0 | Jan Šefl | Czech Republic | 53.21 | |
| 34 | 4 | 5 | Simon Sjödin | Sweden | 53.40 | |
| 35 | 4 | 1 | Omar Eissa | Egypt | 53.68 | |
| 35 | 6 | 0 | Albert Subirats | Venezuela | 53.68 | |
| 37 | 3 | 3 | Guy Barnea | Israel | 53.76 | |
| 37 | 5 | 9 | Geoffrey Cheah | Hong Kong | 53.76 | |
| 39 | 4 | 3 | Ben Hockin | Paraguay | 53.92 | |
| 40 | 4 | 4 | Mario Todorović | Croatia | 54.00 | |
| 41 | 5 | 6 | Glenn Victor Sutanto | Indonesia | 54.18 | |
| 42 | 3 | 1 | Zuhayr Pigot | Suriname | 54.20 | |
| 43 | 4 | 7 | Nuno Quintanilha | Portugal | 54.27 | |
| 44 | 3 | 5 | Abbas Qali | Kuwait | 54.35 | |
| 45 | 4 | 2 | Ralf Tribuntsov | Estonia | 54.38 | |
| 46 | 3 | 8 | Franco Reyes | Panama | 54.49 | |
| 47 | 4 | 6 | Bradlee Ashby | New Zealand | 54.57 | |
| 48 | 4 | 9 | Esnaider Reales | Colombia | 54.63 | |
| 49 | 3 | 4 | Tadas Duškinas | Lithuania | 54.76 | |
| 50 | 7 | 0 | Daniel Ramírez | Mexico | 55.28 | |
| 51 | 3 | 9 | Teimuraz Kobakhidze | Georgia | 55.37 | |
| 52 | 2 | 4 | Ifa Paea | Tonga | 55.80 | |
| 53 | 3 | 0 | Ayman Kelzi | Syria | 55.84 | |
| 54 | 3 | 7 | Raphaël Stacchiotti | Luxembourg | 55.96 | |
| 55 | 2 | 5 | Ralph Goveia | Zambia | 56.34 | |
| 56 | 2 | 1 | Nouamane Batahi | Morocco | 57.11 | |
| 57 | 2 | 6 | Aldo Castillo | Bolivia | 57.38 | |
| 58 | 2 | 2 | Winter Heaven | Samoa | 57.47 | |
| 59 | 2 | 9 | Joshua Daniel | Saint Lucia | 57.66 | |
| 60 | 2 | 3 | Cherantha de Silva | FINA Independent Athletes | 57.79 | |
| 61 | 2 | 0 | Oumar Touré | Mali | 58.00 | |
| 62 | 2 | 8 | Boško Radulović | Montenegro | 58.10 | |
| 63 | 1 | 3 | Ifeakachuku Nmor | Nigeria | 58.48 | |
| 64 | 2 | 7 | Batsaikhany Dulguun | Mongolia | 58.57 | |
| 65 | 1 | 4 | Pou Sovijja | Cambodia | 58.92 | |
| 66 | 1 | 5 | Hasan Sadeq | Iraq | 59.58 | |
| 67 | 1 | 6 | Ismaël Kane | Senegal | 1:00.94 | |
| 68 | 1 | 7 | Hannibal Gaskin | Guyana | 1:01.47 | |
| 69 | 1 | 2 | Thint Myat | Myanmar | 1:02.78 | |
| 70 | 1 | 1 | Hilal Hemed Hilal | Tanzania | 1:03.87 | |
| 71 | 1 | 0 | Mark Hoare | Eswatini | 1:04.76 | |
| 72 | 1 | 8 | Belly-Cresus Ganira | Burundi | 1:07.16 | |
| 73 | 1 | 9 | Chaoili Aonzoudine | Comoros | 1:21.89 | |
| | 3 | 2 | Hoàng Quý Phước | Vietnam | | DNS |
| | 4 | 0 | Dylan Carter | Trinidad and Tobago | | DNS |
| | 4 | 8 | Louis Croenen | Belgium | | DNS |
| | 5 | 3 | Rafael Muñoz | Spain | | DNS |
| | 5 | 8 | Mauricio Fiol | Peru | | DNS |
| | 6 | 1 | Thiago Pereira | Brazil | | DNS |
| | 8 | 0 | Mateo González | Mexico | | DNS |

### Semifinals

The semifinals were held on 7 August at 18.35.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Tom Shields | United States | 51.03 | Q |
| 2 | 6 | Chad le Clos | South Africa | 51.11 | Q |
| 3 | 5 | Konrad Czerniak | Poland | 51.29 | Q |
| 4 | 3 | Takuro Fujii | Japan | 51.58 | |
| 5 | 1 | Jayden Hadler | Australia | 52.09 | |
| 6 | 2 | Tim Phillips | United States | 52.14 | |
| 7 | 7 | Piero Codia | Italy | 52.22 | |
| 8 | 8 | Pavel Sankovich | Belarus | 52.63 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | László Cseh | Hungary | 51.03 | Q |
| 2 | 5 | Li Zhuhao | China | 51.33 | Q, WJ |
| 3 | 1 | Mehdy Metella | France | 51.39 | Q, NR |
| 4 | 3 | Joseph Schooling | Singapore | 51.40 | Q, NR |
| 5 | 6 | Paweł Korzeniowski | Poland | 51.51 | Q |
| 6 | 2 | Matteo Rivolta | Italy | 51.64 | =NR |
| 7 | 7 | Steffen Deibler | Germany | 52.07 | |
| 8 | 8 | Tommaso D'Orsogna | Australia | 52.26 | |

### Final

The final was held on 8 August at 18:13.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 3 | Chad le Clos | South Africa | 50.56 | AF |
| | 5 | László Cseh | Hungary | 50.87 | NR |
| | 1 | Joseph Schooling | Singapore | 50.96 | AS |
| 4 | 4 | Tom Shields | United States | 51.06 | |
| 5 | 7 | Mehdy Metella | France | 51.24 | NR |
| 6 | 6 | Konrad Czerniak | Poland | 51.28 | |
| 7 | 8 | Paweł Korzeniowski | Poland | 51.46 | |
| 8 | 2 | Li Zhuhao | China | 51.66 | |