# Swimming at the 2005 World Aquatics Championships – Men's 100 metre butterfly

The Men's 100 Butterfly at the 2005 FINA World Aquatics Championships was swum 29 – 30 July 2005 in Montreal, Canada. Preliminary and Semifinals heats were held on 29 July, with the top-16 finishers from the Prelims in the mornings advancing to swim again in Semifinals that evening. The top-8 swimmers from the Semifinals then advanced to swim the race a third time in the Final the next evening (30 July).
This race consists of 2 lengths of butterfly, in the long course (50m) pool the event was swum in.
At the start of the event, the existing World (WR) and Championships (CR) records were:
| Record | Time | Swimmer | Location | Date |
| WR | 50.76 | Ian Crocker, USA | Long Beach, USA | 13 July 2004 |
| CR | 50.98 | Ian Crocker, USA | Barcelona, Spain | 26 July 2003 |
The following records were established during the competition:
| Date | Round | Swimmer | Time | WR | CR |
| July 30 | Final | Ian Crocker, USA | 50.40 | WR | CR |

## Results
### Final

| Place | Swimmer | Nation | Time | Notes |
| | Ian Crocker | USA | 50.40 | WR |
| | Michael Phelps | USA | 51.65 | |
| | Andriy Serdinov | Ukraine | 52.08 | |
| 4 | Igor Marchenko | Russia | 52.35 | |
| 5 | Evgeny Korotyshkin | Russia | 52.87 | |
| 5 | Mike Mintenko | Canada | 52.87 | |
| 7 | Kaio Almeida | Brazil | 53.13 | |
| 8 | Ryo Takayasu | Japan | 53.28 | |

### Semifinals

| Place | Heat+Lane | Swimmer | Nation | Time | Notes |
| 1 | S2 L4 | Ian Crocker | USA | 51.08 | q |
| 2 | S1 L4 | Michael Phelps | USA | 52.02 | q |
| 3 | S2 L5 | Igor Marchenko | Russia | 52.23 | q |
| 4 | S1 L1 | Evgeny Korotyshkin | Russia | 52.68 | q |
| 5 | S1 L5 | Andriy Serdinov | Ukraine | 52.75 | q |
| 6 | S1 L2 | Ryo Takayasu | Japan | 52.84 | q |
| 7 | S2 L2 | Kaio Almeida | Brazil | 52.92 | q |
| 7 | S2 L7 | Mike Mintenko | Canada | 52.92 | q |
| 9 | S2 L8 | Moss Burmester | New Zealand | 53.00 | |
| 10 | S1 L3 | Milorad Čavić | Serbia and Montenegro | 53.06 | |
| 11 | S1 L8 | Romain Barnier | France | 53.17 | |
| 12 | S2 L3 | Thomas Rupprath | Germany | 53.20 | |
| 13 | S1 L6 | Gabriel Mangabeira | Brazil | 53.25 | |
| 14 | S1 L7 | Ryuichi Shibata | Japan | 53.34 | |
| 15 | S2 L1 | Ryan Pini | Papua New Guinea | 53.36 | |
| 16 | S2 L6 | Peter Mankoč | Slovenia | 53.51 | |

### Preliminaries

| Rank | Heat+Lane | Swimmer | Nation | Time | Notes |
| 1 | H11 L4 | Ian Crocker | United States | 51.19 | q |
| 2 | H12 L4 | Michael Phelps | United States | 52.32 | q |
| 3 | H11 L6 | Igor Marchenko | Russia | 52.76 | q |
| 4 | H10 L4 | Andriy Serdinov | Ukraine | 52.94 | q |
| 5 | H10 L3 | Thomas Rupprath | Germany | 53.03 | q |
| 6 | H11 L5 | Milorad Čavić | Serbia and Montenegro | 53.07 | q |
| 7 | H11 L8 | Peter Mankoč | Slovenia | 53.13 | q |
| 8 | H12 L5 | Gabriel Mangabeira | Brazil | 53.15 | q |
| 9 | H10 L6 | Kaio Almeida | Brazil | 53.21 | q |
| 9 | H12 L6 | Ryo Takayasu | Japan | 53.21 | q |
| 11 | H11 L2 | Mike Mintenko | Canada | 53.26 | q |
| 12 | H12 L1 | Ryuichi Shibata | Japan | 53.37 | q |
| 13 | H12 L2 | Ryan Pini | Papua New Guinea | 53.39 | q |
| 14 | H10 L5 | Evgeny Korotyshkin | Russia | 53.41 | q |
| 15 | H10 L7 | Moss Burmester | New Zealand | 53.42 | q |
| 16 | H12 L7 | Romain Barnier | France | 53.43 | q |
| 17 | H11 L7 | Andrew Richards | Australia | 53.55 | |
| 18 | H12 L3 | Corney Swanepoel | New Zealand | 53.62 | |
| 19 | H11 L1 | Andrew Lauterstein | Australia | 53.74 | |
| 20 | H10 L1 | Ioan Gherghel | Romania | 53.77 | |
| 21 | H10 L2 | Denys Sylantyev | Ukraine | 54.02 | |
| 22 | H11 L3 | Helge Meeuw | Germany | 54.13 | |
| 23 | H10 L8 | Dzianis Silkov | Belarus | 54.49 | |
| 24 | H9 L4 | Rustam Khudiyev | Kazakhstan | 54.65 | |
| 25 | H7 L7 | Guntars Deicmans | Latvia | 54.67 | |
| 26 | H12 L8 | Jakob Andkjær | Denmark | 54.72 | |
| 27 | H9 L6 | Georgi Palazov | Bulgaria | 54.74 | |
| 28 | H9 L8 | Thomas Kindler | Canada | 54.79 | |
| 29 | H9 L3 | Ravil Nachaev | Uzbekistan | 54.82 | |
| 30 | H9 L2 | Romāns Miloslavskis | Latvia | 54.88 | |
| 31 | H9 L5 | Jernej Mencinger | Slovenia | 55.07 | |
| 32 | H7 L3 | Gordon Touw Ngie Tjouw | Suriname | 55.12 | |
| 33 | H8 L1 | Roman Krolov | Estonia | 55.15 | |
| 34 | H8 L8 | Erez Feren | Israel | 55.36 | |
| 35 | H8 L3 | Jeong Nam Yu | South Korea | 55.37 | |
| 35 | H9 L7 | Hjoertur Mar Reynisson | Iceland | 55.37 | |
| 37 | H7 L2 | Julio Galofre | Colombia | 55.46 | |
| 38 | H6 L6 | Jacob Carstensen | Denmark | 55.70 | |
| 39 | H8 L4 | Nadav Kochavi | Israel | 55.73 | |
| 40 | H8 L5 | Mansoor Al-Mansoor | Kuwait | 55.95 | |
| 41 | H8 L7 | Oleg Lyashko | Uzbekistan | 56.12 | |
| 42 | H7 L8 | Yong Chung | South Korea | 56.20 | |
| 43 | H7 L1 | Wing Cheun Wong | Macau | 56.24 | |
| 44 | H6 L5 | Shaune Fraser | Cayman Islands | 56.26 | |
| 45 | H8 L6 | Aghiles Slimani | Algeria | 56.46 | |
| 46 | H8 L2 | Andy Wibowo | Indonesia | 56.57 | |
| 47 | H5 L4 | Jacinto Ayala | Dominican Republic | 56.93 | |
| 48 | H5 L5 | Jason Dunford | Kenya | 56.95 | |
| 49 | H4 L6 | Miguel Navarro | Bolivia | 57.20 | |
| 50 | H7 L6 | Cheng Xun Ng | Singapore | 57.41 | |
| 51 | H5 L3 | James Walsh | Philippines | 57.59 | |
| 51 | H6 L1 | Waleed Al-Qahtani | Kuwait | 57.59 | |
| 53 | H6 L8 | Shawn Clarke | Barbados | 57.74 | |
| 54 | H4 L4 | Michael O'Connor | Bermuda | 58.02 | |
| 55 | H6 L7 | Nguyen Thanh Hai | Vietnam | 58.05 | |
| 56 | H5 L7 | Zurab Khomasuridze | Georgia | 58.06 | |
| 57 | H5 L6 | Basil Kaaki | Lebanon | 58.10 | |
| 58 | H6 L3 | Gary Tan | Singapore | 58.17 | |
| 59 | H7 L4 | Ioannis Drymonakos | Greece | 58.33 | |
| 60 | H7 L5 | Chi-Chieh Hsu | Chinese Taipei | 58.38 | |
| 61 | H3 L4 | Khaly Ciss | Senegal | 58.57 | |
| 62 | H5 L1 | Scott Hensley | Virgin Islands | 58.82 | |
| 63 | H6 L2 | Joao Matias | Angola | 58.93 | |
| 64 | H4 L5 | Daniel Carrillo | Paraguay | 58.96 | |
| 65 | H5 L8 | Bader Almuhana | Saudi Arabia | 59.14 | |
| 66 | H4 L1 | Alexander Ray | Namibia | 59.19 | |
| 67 | H6 L4 | Édgar Crespo | Panama | 59.23 | |
| 68 | H3 L3 | Jared Heine | Marshall Islands | 59.30 | |
| 69 | H3 L5 | Sean Ehere | Barbados | 59.41 | |
| 70 | H1 L5 | Yan Lin Aung | Myanmar | 59.53 | |
| 71 | H3 L7 | Rama Vyombo | Kenya | 59.55 | |
| 72 | H3 L8 | Sunny Ayejoh | Nigeria | 59.69 | |
| 73 | H2 L4 | Morgan Locke | Virgin Islands | 59.84 | |
| 74 | H4 L3 | Brad Hamilton | Jamaica | 1:00.13 | |
| 75 | H4 L2 | Fernando Medrano | Nicaragua | 1:00.15 | |
| 76 | H4 L8 | Francisco Montenegro | Guatemala | 1:00.51 | |
| 77 | H1 L3 | Tamatoa Ellacott | Tahiti | 1:00.66 | |
| 78 | H3 L1 | Graham Smith | Bermuda | 1:00.71 | |
| 79 | H3 L6 | Tunui Cowan | Tahiti | 1:01.03 | |
| 80 | H3 L2 | Reginaldo Panting | Honduras | 1:01.09 | |
| 81 | H2 L5 | Marcelo Alba | Bolivia | 1:01.78 | |
| 82 | H4 L7 | Antonio Tong | Macau | 1:01.96 | |
| 83 | H2 L3 | Hisham Fadhul | Bahrain | 1:02.53 | |
| 84 | H2 L6 | Alain Brigion-Tobe | Cameroon | 1:04.63 | |
| 85 | H2 L2 | Jonathan Calderon | Saint Lucia | 1:06.56 | |
| 86 | H1 L4 | Remigio Chilanle | Mozambique | 1:08.96 | |
| - | H2 L7 | Earlando McRae | Guyana | DQ | |
| - | H5 L2 | Ahmed Md Jewel | Bangladesh | DNS | |
| - | H9 L1 | Ahmed Salah | Egypt | DNS | |