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

The men's 100 metre breaststroke event at the 2001 World Aquatics Championships took place 24 July. The heats and semifinals took place 23 July, with the final being held on 24 July.

## Records

Prior to the competition, the existing world and championship records were as follows:
| World record | Roman Sludnov (RUS) | 59.94 | Moscow, Russia | 29 June 2001 |
| Championship record | Norbert Rózsa (HUN) | 1:01.24 | Rome, Italy | 5 September 1994 |
The following record was established during the competition:
| Date | Round | Name | Nation | Time | Record |
| 23 July | Heat 7 | Kosuke Kitajima | Japan | 1:00.95 | CR |
| 23 July | Heat 8 | Roman Sloudnov | Russia | 1:00.40 | CR |
| 23 July | Semifinal 2 | Roman Sloudnov | Russia | 59.94 | WR |

## Results
### Heats

| Rank | Name | Nationality | Time | Notes |
| 1 | Roman Sloudnov | Russia | 1:00.40 | Q, CR |
| 2 | Kosuke Kitajima | Japan | 1:00.95 | Q |
| 3 | Ed Moses | United States | 1:01.12 | Q |
| 4 | Domenico Fioravanti | Italy | 1:01.29 | Q |
| 5 | Morgan Knabe | Canada | 1:01.50 | Q |
| 6 | Darren Mew | United Kingdom | 1:01.93 | Q |
| 7 | Oleg Lisogor | Ukraine | 1:02.03 | Q |
| 8 | Ryosuke Imai | Japan | 1:02.21 | Q |
| 9 | Hugues Duboscq | France | 1:02.34 | Q |
| 10 | Daniel Málek | Czech Republic | 1:02.38 | Q |
| 11 | Simon Cowley | Australia | 1:02.42 | Q |
| 12 | Jarno Pihlava | Finland | 1:02.49 | Q |
| 13 | Károly Güttler | Hungary | 1:02.50 | Q |
| 13 | José Couto | Portugal | 1:02.50 | Q |
| 15 | Eduardo Fischer | Brazil | 1:02.51 | Q |
| 16 | Maxim Podoprigora | Austria | 1:02.52 | Q |
| 17 | Jens Kruppa | Germany | 1:02.54 | |
| 18 | Davide Rummolo | Italy | 1:02.60 | |
| 19 | Dmitri Komornikov | Russia | 1:02.62 | |
| 20 | Regan Harrison | Australia | 1:02.65 | |
| 21 | Vanja Rogulj | Croatia | 1:02.83 | |
| 22 | Elvin Chia | Malaysia | 1:02.88 | |
| 23 | Anthony Robinson | United States | 1:02.98 | |
| 24 | Martin Gustafsson | Sweden | 1:03.33 | |
| 25 | Remo Lütolf | Switzerland | 1:03.56 | |
| 26 | Álvaro Fortuny | Guatemala | 1:04.11 | |
| 27 | Raiko Pachel | Estonia | 1:04.36 | |
| 28 | Jakob Jóhann Sveinsson | Iceland | 1:04.41 | |
| 29 | Dov Malnik | Israel | 1:04.71 | |
| 30 | Zeng Qiliang | China | 1:04.93 | |
| 31 | Tam Chi Kin | Hong Kong | 1:04.94 | |
| 32 | Wickus Nienaber | Eswatini | 1:05.10 | |
| 33 | Vladimir Labzin | Estonia | 1:05.15 | |
| 34 | Ansel Tjin A Tam | Suriname | 1:05.24 | |
| 35 | Valery Kalmikovs | Latvia | 1:05.36 | |
| 36 | Yang Shang-Hsuan | Chinese Taipei | 1:05.60 | |
| 37 | Michael Williamson | Ireland | 1:05.78 | |
| 38 | Malick Fall | Senegal | 1:06.09 | |
| 39 | Chen Cho-Yi | Chinese Taipei | 1:06.83 | |
| 40 | Jean Luc Razakarivony | Madagascar | 1:07.07 | |
| 41 | Abdul Hafiz Salleh | Malaysia | 1:07.20 | |
| 42 | Rainui Teriipaia | Tahiti | 1:07.36 | |
| 43 | Sergey Voytsekhovich | Uzbekistan | 1:07.88 | |
| 44 | Graham Smith | Bermuda | 1:08.13 | |
| 45 | Baktash Gheidi | Iran | 1:08.40 | |
| 46 | Andrei Zaharov | Moldova | 1:08.72 | |
| 47 | Guillermo Henriquez | Dominican Republic | 1:08.90 | |
| 48 | Chan Wai Ma | Macau | 1:08.98 | |
| 48 | Khaly Ciss | Senegal | 1:08.98 | |
| 50 | Daniel Kang | Guam | 1:10.73 | |
| 51 | Onan Thom | Guyana | 1:12.48 | |
| 52 | Khurlee Enkhmandakh | Mongolia | 1:14.03 | |
| 53 | João Carlos Paquet Aguiar | Angola | 1:14.71 | |
| 53 | Zie Ahmed Oyattara | Ivory Coast | 1:14.71 | |
| 55 | Seung Gin Lee | Northern Mariana Islands | 1:15.65 | |
| 56 | Alice Shrestha | Nepal | 1:17.11 | |
| 57 | Ganbold Urnultsaikhan | Mongolia | 1:17.92 | |
| 58 | Iyad Housheya | Palestine | 1:18.02 | |
| 59 | Dean Palacios | Northern Mariana Islands | 1:18.43 | |
| 60 | Fahd Bayusuf | Kenya | 1:20.73 | |
| 61 | Mamadou Diallo | Guinea | 1:25.29 | |
| – | Oday Mohammad | Iraq | DSQ | |
| – | Bounchanh Khamchanh | Laos | DNS | |
| – | Juan José Madrigal | Costa Rica | DNS | |

### Semifinals

| Rank | Name | Nationality | Time | Notes |
| 1 | Roman Sloudnov | Russia | 59.94 | Q, WR |
| 2 | Ed Moses | United States | 1:00.55 | Q |
| 3 | Kosuke Kitajima | Japan | 1:00.61 | Q |
| 4 | Domenico Fioravanti | Italy | 1:00.66 | Q |
| 5 | Oleg Lisogor | Ukraine | 1:01.24 | Q |
| 6 | Morgan Knabe | Canada | 1:01.25 | Q |
| 7 | Darren Mew | United Kingdom | 1:01.47 | Q |
| 8 | Hugues Duboscq | France | 1:01.96 | Q |
| 9 | Jarno Pihlava | Finland | 1:02.02 | |
| 10 | Daniel Málek | Czech Republic | 1:02.10 | |
| 11 | José Couto | Portugal | 1:02.17 | |
| 12 | Károly Güttler | Hungary | 1:02.18 | |
| 13 | Maxim Podoprigora | Austria | 1:02.22 | |
| 14 | Simon Cowley | Australia | 1:02.35 | |
| 15 | Ryosuke Imai | Japan | 1:02.49 | |
| 16 | Eduardo Fischer | Brazil | 1:03.08 | |

### Final

| Rank | Name | Nationality | Time |
| | Roman Sloudnov | Russia | 1:00.16 |
| | Domenico Fioravanti | Italy | 1:00.47 |
| | Ed Moses | United States | 1:00.61 |
| 4 | Kosuke Kitajima | Japan | 1:00.67 |
| 5 | Morgan Knabe | Canada | 1:01.27 |
| 6 | Oleg Lisogor | Ukraine | 1:01.51 |
| 7 | Darren Mew | United Kingdom | 1:01.92 |
| 8 | Hugues Duboscq | France | 1:01.94 |