# Swimming at the 2001 World Aquatics Championships – Men's 50 metre butterfly

The men's 50 metre butterfly event at the 2001 World Aquatics Championships took place 28 July. The heats and semifinals took place 27 July, with the final being held on 28 July.

## Records

Prior to the competition, the existing world and championship records were as follows:
| World record | Geoff Huegill (AUS) | 23.60 | Sydney, Australia | 14 May 2000 |
| Championship record | New event | New event | New event | New event |
The following record was established during the competition:
| Date | Round | Name | Nation | Time | Record |
| 27 July | Heat 10 | Geoff Huegill | Australia | 23.71 | CR |
| 27 July | Semifinal 2 | Geoff Huegill | Australia | 23.44 | WR |

## Results
### Heats

| Rank | Name | Nationality | Time | Notes |
| 1 | Geoff Huegill | Australia | 23.71 | Q, CR |
| 2 | Jere Hård | Finland | 23.91 | Q |
| 3 | Roland Schoeman | South Africa | 23.96 | Q |
| 4 | Mark Foster | United Kingdom | 24.02 | Q |
| 5 | Lars Frölander | Sweden | 24.03 | Q |
| 6 | Ewout Holst | Netherlands | 24.08 | Q |
| 7 | Vladislav Kulikov | Russia | 24.14 | Q |
| 8 | Ian Crocker | United States | 24.27 | Q |
| 9 | Joris Keizer | Netherlands | 24.28 | Q |
| 10 | Thomas Rupprath | Germany | 24.31 | Q |
| 11 | Zsolt Gáspár | Hungary | 24.36 | Q |
| 12 | Ravil Nachaev | Uzbekistan | 24.38 | Q |
| 13 | Michael Klim | Australia | 24.39 | Q |
| 14 | Pablo Martín Abal | Argentina | 24.40 | Q |
| 15 | Tero Välimaa | Finland | 24.42 | Q |
| 16 | Andriy Serdinov | Ukraine | 24.45 | QSO |
| 16 | Oswaldo Quevedo | Venezuela | 24.45 | QSO |
| 18 | Duje Draganja | Croatia | 24.47 | |
| 19 | Igor Marchenko | Russia | 24.50 | |
| 20 | Javier Noriega | Spain | 24.53 | |
| 21 | Daniel Jones | United States | 24.55 | |
| 22 | Mike Mintenko | Canada | 24.57 | |
| 22 | Miloš Milošević | Croatia | 24.57 | |
| 24 | Camilo Becerra | Colombia | 24.58 | |
| 25 | Fabian Friedrich | Germany | 24.59 | |
| 26 | Ryo Takayasu | Japan | 24.64 | |
| 27 | Milorad Čavić | Yugoslavia | 24.79 | |
| 28 | Takashi Yamamoto | Japan | 24.83 | |
| 28 | Dzmitri Koshel | Belarus | 24.83 | |
| 28 | Nicholas Santos | Brazil | 24.83 | |
| 31 | Jorge Luis Ulibarri | Spain | 24.93 | |
| 32 | Petter Sjodal | Norway | 24.95 | |
| 33 | Jesús González | Mexico | 24.96 | |
| 34 | Fernando Alves | Brazil | 25.05 | |
| 35 | Kim Min-Suk | South Korea | 25.09 | |
| 36 | Simão Morgado | Portugal | 25.18 | |
| 37 | Lorenz Liechti | Switzerland | 25.19 | |
| 38 | Luc Decker | Luxembourg | 25.21 | |
| 39 | Rolandas Gimbutis | Lithuania | 25.27 | |
| 40 | Danil Haustov | Estonia | 25.34 | |
| 41 | Georgi Palazov | Bulgaria | 25.58 | |
| 42 | Aleksandar Miladinovski | North Macedonia | 25.77 | |
| 43 | Cesar Uribe | Mexico | 25.84 | |
| 44 | Ismael Ortiz | Panama | 26.02 | |
| 45 | Zoran Lazarevski | North Macedonia | 26.08 | |
| 46 | Carl Probert | Fiji | 26.09 | |
| 47 | Ying Wah Leslie Kwok | Singapore | 26.13 | |
| 48 | Wu Nien-Pin | Chinese Taipei | 26.15 | |
| 49 | Dean Kent | New Zealand | 26.17 | |
| 50 | Gustavo Barrios | Panama | 26.20 | |
| 50 | Musa Bakare | Nigeria | 26.20 | |
| 52 | Wing Cheung Victor Wong | Macau | 26.58 | |
| 53 | Christophe Lim Wen Ying | Mauritius | 26.60 | |
| 54 | Gregory Arkhurst | Ivory Coast | 26.62 | |
| 55 | Yu Lung Lubrey Lim | Malaysia | 26.70 | |
| 56 | Kenny Roberts | Seychelles | 26.78 | |
| 57 | Nicholas Diaper | Kenya | 26.83 | |
| 58 | Saad Khalloqi | Morocco | 26.85 | |
| 59 | Cliff Gittens | Barbados | 26.86 | |
| 60 | Benjamin Gan | Singapore | 26.88 | |
| 61 | Keng Ip Lou | Macau | 27.12 | |
| 62 | Davy Bisslik | Aruba | 27.17 | |
| 63 | Ahmed Ouattara Zie | Ivory Coast | 27.19 | |
| 64 | Hamid Nassir | Kenya | 27.41 | |
| 65 | Chen Jui-Chen | Chinese Taipei | 27.47 | |
| 66 | Naji Ferguson | Grenada | 27.49 | |
| 67 | Gael Souci | Mauritius | 27.55 | |
| 68 | Sergio Rafael De Leon Alfaro | Guatemala | 27.76 | |
| 69 | Zaid Saeed | Iraq | 27.78 | |
| 70 | João Aguiar | Angola | 27.90 | |
| 71 | Bertrand Bristol | Seychelles | 27.97 | |
| 72 | Daniel Kang | Guam | 28.00 | |
| 73 | Mohammad Nazeri | Iran | 28.19 | |
| 74 | Dean Palacios | Northern Mariana Islands | 28.61 | |
| 75 | Kenneth Maronie | Dominica | 28.69 | |
| 76 | Rainui Teriipaia | Tahiti | 28.90 | |
| 77 | Seung Gin Lee | Northern Mariana Islands | 28.99 | |
| 78 | Nuno Miguel Rola | Angola | 29.44 | |
| 79 | Kin-Vincent Duenas | Guam | 29.74 | |
| 80 | Rony Bakale | Republic of the Congo | 31.46 | |
| – | Derya Buyukuncu | Turkey | DNS | |
| – | Eithan Urbach | Israel | DNS | |
| – | Mehdi Addadi | Algeria | DNS | |
| – | Mamoon Ahmad | Sudan | DNS | |
| – | Peter Mankoc | Slovenia | DNS | |
| – | Khuwiater Saeed Had Al Dhaheri | United Arab Emirates | DNS | |

#### Swim-off

| Rank | Name | Nationality | Time | Notes |
| 1 | Andriy Serdinov | Ukraine | 24.47 | Q |
| 2 | Oswaldo Quevedo | Venezuela | 24.54 | |

### Semifinals

| Rank | Name | Nationality | Time | Notes |
| 1 | Geoff Huegill | Australia | 23.44 | Q, WR |
| 2 | Mark Foster | United Kingdom | 23.66 | Q |
| 3 | Roland Schoeman | South Africa | 23.68 | Q |
| 4 | Lars Frölander | Sweden | 23.73 | Q |
| 5 | Ewout Holst | Netherlands | 23.91 | Q |
| 6 | Tero Välimaa | Finland | 23.93 | Q |
| 7 | Ian Crocker | United States | 23.97 | Q |
| 8 | Thomas Rupprath | Germany | 24.01 | Q |
| 9 | Jere Hård | Finland | 24.04 | |
| 10 | Vladislav Kulikov | Russia | 24.18 | |
| 11 | Michael Klim | Australia | 24.23 | |
| 12 | Pablo Martín Abal | Argentina | 24.26 | |
| 13 | Andriy Serdinov | Ukraine | 24.31 | |
| 14 | Ravil Nachaev | Uzbekistan | 24.40 | |
| 14 | Joris Keizer | Netherlands | 24.40 | |
| 16 | Zsolt Gáspár | Hungary | 24.45 | |

### Final

| Rank | Name | Nationality | Time |
| | Geoff Huegill | Australia | 23.50 |
| | Lars Frölander | Sweden | 23.57 |
| | Mark Foster | United Kingdom | 23.62 |
| 4 | Roland Schoeman | South Africa | 23.76 |
| 5 | Ian Crocker | United States | 23.85 |
| 6 | Ewout Holst | Netherlands | 23.99 |
| 7 | Tero Välimaa | Finland | 24.10 |
| 8 | Thomas Rupprath | Germany | 24.16 |