# Swimming at the 2001 World Aquatics Championships – Men's 100 metre butterfly

The men's 100 metre butterfly event at the 2001 World Aquatics Championships took place 26 July. The heats and semifinals took place on 25 July, with the final being held on 26 July.

## Records

Prior to the competition, the existing world and championship records were as follows:
| World record | Michael Klim (AUS) | 51.81 | Canberra, Australia | 12 December 1999 |
| Championship record | Michael Klim (AUS) | 52.25 | Perth, Australia | 16 January 1998 |
The following record was established during the competition:
| Date | Round | Name | Nation | Time | Record |
| 25 July 2001 | Semifinal | Lars Frölander | Sweden | 52.17 | CR |
| 26 July 2001 | Final | Lars Frölander | Sweden | 52.10 | CR |

## Results
### Heats

| Rank | Name | Nationality | Time | Notes |
| 1 | Andriy Serdinov | Ukraine | 52.97 | Q |
| 2 | Vladislav Kulikov | Russia | 53.03 | Q |
| 3 | Mike Mintenko | Canada | 53.04 | Q |
| 3 | Geoff Huegill | Australia | 53.04 | Q |
| 5 | Ian Crocker | United States | 53.08 | Q |
| 6 | Franck Esposito | France | 53.11 | Q |
| 7 | Lars Frölander | Sweden | 53.14 | Q |
| 8 | Thomas Rupprath | Germany | 53.31 | Q |
| 9 | Igor Martchenko | Russia | 53.52 | Q |
| 10 | Takashi Yamamoto | Japan | 53.53 | Q |
| 10 | Joris Keizer | Netherlands | 53.53 | Q |
| 12 | Tero Välimaa | Finland | 53.66 | Q |
| 13 | Jere Hård | Finland | 53.73 | Q |
| 14 | Michael Klim | Australia | 53.83 | Q |
| 15 | Denys Sylantyev | Ukraine | 53.86 | Q |
| 16 | Ouyang Kunpeng | China | 53.94 | Q |
| 17 | Peter Mankoč | Slovenia | 54.03 | |
| 18 | Zsolt Gáspár | Hungary | 54.06 | |
| 19 | Daniel Jones | United States | 54.20 | |
| 20 | Ryo Takayasu | Japan | 54.22 | |
| 21 | Ioan Gherghel | Romania | 54.26 | |
| 22 | Fernando Alves | Brazil | 54.36 | |
| 22 | Christian Galenda | Italy | 54.36 | |
| 24 | Daniel Morales | Spain | 54.50 | |
| 25 | Simão Morgado | Portugal | 54.64 | |
| 26 | Pablo Martín Abal | Argentina | 54.65 | |
| 27 | Milorad Čavić | Yugoslavia | 54.71 | |
| 28 | Camilo Becerra | Colombia | 54.79 | |
| 29 | Andrew Livingston | Puerto Rico | 54.93 | |
| 30 | Fabian Friedrich | Germany | 54.98 | |
| 31 | Ivan Mladina | Croatia | 55.03 | |
| 32 | Oswaldo Quevedo | Venezuela | 55.18 | |
| 33 | Cesar Uribe | Mexico | 55.19 | |
| 34 | Aleksandar Miladinovski | North Macedonia | 55.30 | |
| 34 | Jesús González | Mexico | 55.30 | |
| 36 | Ioannis Drymonakos | Greece | 55.95 | |
| 37 | Dzmitri Koshel | Belarus | 56.19 | |
| 38 | Luc Decker | Luxembourg | 56.23 | |
| 39 | Lorenz Liechti | Switzerland | 56.47 | |
| 40 | Zoran Lazarevski | North Macedonia | 56.56 | |
| 41 | Yu Jeong-Nam | South Korea | 56.59 | |
| 42 | Petter Sjodal | Norway | 56.64 | |
| 43 | Oleg Lyashko | Uzbekistan | 56.89 | |
| 43 | Joe Jae-Hyon | South Korea | 56.89 | |
| 45 | Benjamin Gan | Singapore | 56.97 | |
| 46 | Danil Haustov | Estonia | 57.09 | |
| 47 | Wu Nien-Pin | Chinese Taipei | 57.34 | |
| 48 | Mark Chay | Singapore | 57.66 | |
| 49 | Carlos Meléndez | El Salvador | 58.54 | |
| 50 | Yu Lung Lubrey Lim | Malaysia | 58.56 | |
| 51 | Nicholas Diaper | Kenya | 58.59 | |
| 52 | Gustavo Barrios | Panama | 58.98 | |
| 53 | Sergio Rafael De Leon Alfaro | Guatemala | 59.02 | |
| 54 | Chon Kit Alias Joao Tang | Macau | 59.14 | |
| 55 | Davy Bisslik | Aruba | 59.22 | |
| 56 | Chen Jui-Chen | Chinese Taipei | 59.36 | |
| 57 | Kenny Roberts | Seychelles | 59.45 | |
| 58 | Khuwiater Saeed Had Al Dhaheri | United Arab Emirates | 59.47 | |
| 59 | Christophe Lim Wen Ying | Mauritius | 1:00.04 | |
| 60 | Obaid Ahmed Al Jassimi | United Arab Emirates | 1:00.25 | |
| 61 | Bertrand Bristol | Seychelles | 1:00.38 | |
| 62 | Keng Ip Lou | Macau | 1:00.42 | |
| 63 | Hamid Nassir | Kenya | 1:00.74 | |
| 64 | Omar Núñez | Nicaragua | 1:00.87 | |
| 65 | Zulfiqar Ali | Pakistan | 1:00.97 | |
| 66 | Naji Ferguson | Grenada | 1:01.11 | |
| 67 | Gael Souci | Mauritius | 1:01.36 | |
| 68 | Zaid Saeed | Iraq | 1:02.93 | |
| 69 | João Carlos Paquet Aguiar | Angola | 1:03.52 | |
| 70 | Dean Palacios | Northern Mariana Islands | 1:03.71 | |
| 71 | Bayarerdene Soninerdene | Mongolia | 1:04.82 | |
| 72 | Loren Lindborg | Marshall Islands | 1:09.38 | |
| – | Nuno Miguel Cardoso Rola | Angola | DSQ | |
| – | Georgi Palazov | Bulgaria | DSQ | |
| – | Derya Büyükuncu | Turkey | DNS | |

### Semifinals

| Rank | Name | Nationality | Time | Notes |
| 1 | Lars Frölander | Sweden | 52.17 | Q, CR |
| 2 | Michael Klim | Australia | 52.50 | Q |
| 3 | Takashi Yamamoto | Japan | 52.55 | Q |
| 4 | Ian Crocker | United States | 52.63 | Q |
| 5 | Mike Mintenko | Canada | 52.81 | Q |
| 6 | Geoff Huegill | Australia | 52.91 | Q |
| 7 | Franck Esposito | France | 52.96 | Q |
| 8 | Vladislav Kulikov | Russia | 52.98 | Q |
| 9 | Jere Hård | Finland | 53.08 | |
| 10 | Denys Sylantyev | Ukraine | 53.17 | |
| 11 | Tero Välimaa | Finland | 53.19 | |
| 11 | Andriy Serdinov | Ukraine | 53.19 | |
| 13 | Thomas Rupprath | Germany | 53.27 | |
| 14 | Igor Martchenko | Russia | 53.67 | |
| 15 | Joris Keizer | Netherlands | 53.72 | |
| 16 | Ouyang Kunpeng | China | 54.00 | |

### Final

| Rank | Name | Nationality | Time | Notes |
| | Lars Frölander | Sweden | 52.10 | CR |
| | Ian Crocker | United States | 52.25 | |
| | Geoff Huegill | Australia | 52.36 | |
| 4 | Takashi Yamamoto | Japan | 52.56 | |
| 5 | Vladislav Kulikov | Russia | 52.69 | |
| 6 | Mike Mintenko | Canada | 52.82 | |
| 7 | Michael Klim | Australia | 52.91 | |
| 8 | Franck Esposito | France | 53.33 | |