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

The men's 50 metre breaststroke event at the 2001 World Aquatics Championships took place 29 July. The heats and semifinals took place 28 July, with the final being held on 29 July.

## Records

Prior to the competition, the existing world and championship records were as follows:
| World record | Ed Moses (USA) | 27.39 | Austin, United States | 31 March 2001 |
| Championship record | New event | New event | New event | New event |
The following record was established during the competition:
| Date | Round | Name | Nation | Time | Record |
| 28 July | Heat 7 | James Gibson | United Kingdom | 27.71 | CR |
| 28 July | Semifinal 2 | Mark Warnecke | Germany | 27.59 | CR |
| 29 July | Final | Oleg Lisogor | Ukraine | 27.52 | CR |

## Results
### Heats

| Rank | Name | Nationality | Time | Notes |
| 1 | James Gibson | United Kingdom | 27.71 | Q, CR |
| 2 | Ed Moses | United States | 27.82 | Q |
| 3 | Mark Warnecke | Germany | 27.86 | Q |
| 4 | Oleg Lisogor | Ukraine | 27.92 | Q |
| 5 | Roman Sludnov | Russia | 27.98 | Q |
| 6 | Jarno Pihlava | Finland | 28.18 | Q |
| 7 | Daniel Málek | Czech Republic | 28.22 | Q |
| 7 | Darren Mew | United Kingdom | 28.22 | Q |
| 9 | Domenico Fioravanti | Italy | 28.27 | Q |
| 10 | Patrik Isaksson | Sweden | 28.28 | Q |
| 11 | Hugues Duboscq | France | 28.44 | Q |
| 11 | Anthony Robinson | United States | 28.44 | Q |
| 11 | Morgan Knabe | Canada | 28.44 | Q |
| 14 | Vanja Rogulj | Croatia | 28.49 | Q |
| 15 | José Couto | Portugal | 28.51 | Q |
| 16 | Remo Lütolf | Switzerland | 28.55 | Q |
| 17 | Phil Rogers | Australia | 28.65 | |
| 18 | Kosuke Kitajima | Japan | 28.73 | |
| 19 | Ryosuke Imai | Japan | 28.78 | |
| 20 | Eduardo Fischer | Brazil | 28.80 | |
| 21 | Arseni Maliarov | Russia | 28.84 | |
| 21 | Zeng Qiliang | China | 28.84 | |
| 23 | Simon Cowley | Australia | 28.89 | |
| 24 | Maxim Podoprigora | Austria | 29.09 | |
| 25 | Raiko Pachel | Estonia | 29.13 | |
| 26 | Álvaro Fortuny | Guatemala | 29.47 | |
| 27 | Martin Viilep | Estonia | 29.72 | |
| 28 | Tam Chi Kin | Hong Kong | 29.81 | |
| 29 | Dov Malnik | Israel | 29.87 | |
| 29 | Jakob Jóhann Sveinsson | Iceland | 29.87 | |
| 31 | Wickus Nienaber | Eswatini | 30.16 | |
| 32 | Ansel Tjin A Tam | Suriname | 30.30 | |
| 33 | Michael Williamson | Ireland | 30.38 | |
| 34 | Rainui Teriipaia | Tahiti | 30.39 | |
| 35 | Jean Razakarivony | Madagascar | 30.48 | |
| 36 | Yang Shang-Hsuan | Chinese Taipei | 30.52 | |
| 37 | Abdul Hafiz Salleh | Malaysia | 30.68 | |
| 38 | Baktash Gheidi | Iran | 30.86 | |
| 39 | Malick Fall | Senegal | 31.23 | |
| 40 | Fergus Kuek | Singapore | 31.29 | |
| 41 | Chan Wai Ma | Macau | 31.34 | |
| 42 | Khaly Ciss | Senegal | 31.41 | |
| 43 | Chen Cho-Yi | Chinese Taipei | 31.43 | |
| 44 | Guillermo Henriquez | Dominican Republic | 31.44 | |
| 45 | Graham Smith | Bermuda | 31.72 | |
| 46 | Onan Thom | Guyana | 31.80 | |
| 47 | Daniel Kang | Guam | 31.96 | |
| 48 | Inemi Jas-Spiff | Nigeria | 32.54 | |
| 49 | Oday Mohammad | Iraq | 32.70 | |
| 50 | Ahmed Ouattara Zie | Ivory Coast | 32.75 | |
| 51 | João Aguiar | Angola | 33.02 | |
| 52 | Khurlee Enkhmandakh | Mongolia | 33.58 | |
| 53 | Hamid Nassir | Kenya | 34.02 | |
| 54 | Bounchanh Khamchanh | Laos | 34.61 | |
| 55 | Alice Shrestha | Nepal | 35.06 | |
| 56 | Cole Shade Sule | Cameroon | 35.12 | |
| 57 | Fand Bayusuf | Kenya | 35.71 | |
| 58 | Iyad Housheyeh | Palestine | 35.76 | |
| – | Joshua Marfleet | Samoa | DSQ | |
| – | Juan José Madrigal | Costa Rica | DNS | |
| – | Abbas Alneel | Sudan | DNS | |
| – | Ganbold Urnultsaikhan | Mongolia | DNS | |

### Semifinals

| Rank | Name | Nationality | Time | Notes |
| 1 | Mark Warnecke | Germany | 27.59 | Q, CR |
| 2 | Roman Sludnov | Russia | 27.78 | Q |
| 3 | Ed Moses | United States | 27.90 | Q |
| 4 | Oleg Lisogor | Ukraine | 27.92 | Q |
| 5 | Darren Mew | United Kingdom | 27.95 | Q |
| 6 | Domenico Fioravanti | Italy | 27.96 | Q |
| 7 | Anthony Robinson | United States | 27.97 | Q |
| 8 | James Gibson | United Kingdom | 28.01 | Q |
| 9 | Remo Lütolf | Switzerland | 28.06 | |
| 10 | Daniel Málek | Czech Republic | 28.23 | |
| 11 | Morgan Knabe | Canada | 28.33 | |
| 12 | Vanja Rogulj | Croatia | 28.37 | |
| 13 | Hugues Duboscq | France | 28.40 | |
| 14 | Patrik Isaksson | Sweden | 28.59 | |
| 15 | José Couto | Portugal | 28.62 | |
| 16 | Jarno Pihlava | Finland | 28.65 | |

### Final

| Rank | Name | Nationality | Time | Notes |
| | Oleg Lisogor | Ukraine | 27.52 | CR |
| | Roman Sludnov | Russia | 27.60 | |
| | Domenico Fioravanti | Italy | 27.72 | |
| 4 | Anthony Robinson | United States | 27.73 | |
| 5 | Mark Warnecke | Germany | 27.93 | |
| 6 | Ed Moses | United States | 28.02 | |
| 7 | Darren Mew | United Kingdom | 28.05 | |
| – | James Gibson | United Kingdom | DSQ | |