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.Results
Heats
The heats were held at 10:09| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 6 | László Cseh | 50.91 | Q, NR | |
| 2 | 7 | 4 | Tom Shields | 51.09 | Q | |
| 3 | 7 | 7 | Li Zhuhao | 51.54 | Q, WJ | |
| 4 | 6 | 4 | Konrad Czerniak | 51.58 | Q | |
| 5 | 8 | 6 | Joseph Schooling | 51.65 | Q, NR | |
| 6 | 7 | 2 | Takuro Fujii | 51.76 | Q | |
| 7 | 7 | 6 | Paweł Korzeniowski | 51.79 | Q | |
| 8 | 8 | 4 | Chad le Clos | 51.83 | Q | |
| 9 | 7 | 1 | Matteo Rivolta | 51.88 | Q | |
| 10 | 7 | 5 | Tim Phillips | 51.90 | Q | |
| 10 | 8 | 7 | Steffen Deibler | 51.90 | Q | |
| 12 | 6 | 3 | Piero Codia | 51.94 | Q | |
| 13 | 8 | 2 | Mehdy Metella | 52.07 | Q | |
| 14 | 7 | 3 | Jayden Hadler | 52.17 | Q | |
| 15 | 8 | 1 | Tommaso D'Orsogna | 52.22 | Q | |
| 16 | 6 | 5 | Pavel Sankovich | 52.29 | Q | |
| 17 | 6 | 2 | Adam Barrett | 52.33 | ||
| 18 | 5 | 2 | Santiago Grassi | 52.36 | ||
| 19 | 6 | 8 | Thomas Laxton | 52.37 | ||
| 20 | 8 | 8 | Evgeny Koptelov | 52.38 | ||
| 21 | 6 | 7 | Takeshi Kawamoto | 52.45 | ||
| 22 | 8 | 3 | Vyacheslav Prudnikov | 52.47 | ||
| 23 | 7 | 9 | Viktor Bromer | 52.53 | ||
| 24 | 7 | 8 | Arthur Mendes | 52.55 | ||
| 25 | 6 | 9 | Luis Martínez | 52.72 | ||
| 26 | 8 | 5 | Yauhen Tsurkin | 52.73 | ||
| 27 | 5 | 4 | Alexandru Coci | 52.89 | ||
| 27 | 5 | 5 | Andreas Vazaios | 52.89 | ||
| 29 | 5 | 1 | Nico van Duijn | 52.94 | ||
| 30 | 5 | 7 | Ryan Pini | 53.02 | ||
| 31 | 8 | 9 | Ivan Lenđer | 53.04 | ||
| 32 | 3 | 6 | Robert Žbogar | 53.10 | ||
| 33 | 5 | 0 | Jan Šefl | 53.21 | ||
| 34 | 4 | 5 | Simon Sjödin | 53.40 | ||
| 35 | 4 | 1 | Omar Eissa | 53.68 | ||
| 35 | 6 | 0 | Albert Subirats | 53.68 | ||
| 37 | 3 | 3 | Guy Barnea | 53.76 | ||
| 37 | 5 | 9 | Geoffrey Cheah | 53.76 | ||
| 39 | 4 | 3 | Ben Hockin | 53.92 | ||
| 40 | 4 | 4 | Mario Todorović | 54.00 | ||
| 41 | 5 | 6 | Glenn Victor Sutanto | 54.18 | ||
| 42 | 3 | 1 | Zuhayr Pigot | 54.20 | ||
| 43 | 4 | 7 | Nuno Quintanilha | 54.27 | ||
| 44 | 3 | 5 | Abbas Qali | 54.35 | ||
| 45 | 4 | 2 | Ralf Tribuntsov | 54.38 | ||
| 46 | 3 | 8 | Franco Reyes | 54.49 | ||
| 47 | 4 | 6 | Bradlee Ashby | 54.57 | ||
| 48 | 4 | 9 | Esnaider Reales | 54.63 | ||
| 49 | 3 | 4 | Tadas Duškinas | 54.76 | ||
| 50 | 7 | 0 | Daniel Ramírez | 55.28 | ||
| 51 | 3 | 9 | Teimuraz Kobakhidze | 55.37 | ||
| 52 | 2 | 4 | Ifa Paea | 55.80 | ||
| 53 | 3 | 0 | Ayman Kelzi | 55.84 | ||
| 54 | 3 | 7 | Raphaël Stacchiotti | 55.96 | ||
| 55 | 2 | 5 | Ralph Goveia | 56.34 | ||
| 56 | 2 | 1 | Nouamane Batahi | 57.11 | ||
| 57 | 2 | 6 | Aldo Castillo | 57.38 | ||
| 58 | 2 | 2 | Winter Heaven | 57.47 | ||
| 59 | 2 | 9 | Joshua Daniel | 57.66 | ||
| 60 | 2 | 3 | Cherantha de Silva | FINA Independent Athletes | 57.79 | |
| 61 | 2 | 0 | Oumar Touré | 58.00 | ||
| 62 | 2 | 8 | Boško Radulović | 58.10 | ||
| 63 | 1 | 3 | Ifeakachuku Nmor | 58.48 | ||
| 64 | 2 | 7 | Batsaikhany Dulguun | 58.57 | ||
| 65 | 1 | 4 | Pou Sovijja | 58.92 | ||
| 66 | 1 | 5 | Hasan Sadeq | 59.58 | ||
| 67 | 1 | 6 | Ismaël Kane | |||
| 68 | 1 | 7 | Hannibal Gaskin | |||
| 69 | 1 | 2 | Thint Myat | |||
| 70 | 1 | 1 | Hilal Hemed Hilal | |||
| 71 | 1 | 0 | Mark Hoare | |||
| 72 | 1 | 8 | ||||
| 73 | 1 | 9 | Chaoili Aonzoudine | |||
| 3 | 2 | Hoàng Quý Phước | DNS | |||
| 4 | 0 | Dylan Carter | DNS | |||
| 4 | 8 | Louis Croenen | DNS | |||
| 5 | 3 | Rafael Muñoz | DNS | |||
| 5 | 8 | Mauricio Fiol | DNS | |||
| 6 | 1 | Thiago Pereira | DNS | |||
| 8 | 0 | Mateo González | DNS |
Semifinals
The semifinals were held on 7 August at 18.35.Semifinal 1
Semifinal 2
Final
The final was held on 8 August at 18:13.| Rank | Lane | Name | Nationality | Time | Notes |
| 3 | Chad le Clos | 50.56 | AF | ||
| 5 | László Cseh | 50.87 | NR | ||
| 1 | Joseph Schooling | 50.96 | AS | ||
| 4 | 4 | Tom Shields | 51.06 | ||
| 5 | 7 | Mehdy Metella | 51.24 | NR | |
| 6 | 6 | Konrad Czerniak | 51.28 | ||
| 7 | 8 | Paweł Korzeniowski | 51.46 | ||
| 8 | 2 | Li Zhuhao | 51.66 |