# Swimming at the 2003 World Aquatics Championships – Men's 50 metre butterfly

The Men's 50 Butterfly event at the 10th FINA World Aquatics Championships swam July 20–21, 2003 in Barcelona, Spain. Preliminary and Semifinal heats swam on 20 July, with the Final swum on 21 July.
At the start of the event, the existing World (WR) and Championship (CR) records were both:

## Results
### Final

| Place | Swimmer | Nation | Time | Notes |
| 1 | Matt Welsh | Australia | 23.43 | WR |
| 2 | Ian Crocker | USA | 23.62 | |
| 3 | Evgueni Korotychkine | Russia | 23.73 | |
| 4 | Geoff Huegill | Australia | 23.76 | |
| 5 | Roland Schoeman | South Africa | 23.79 | |
| 6 | Thomas Rupprath | Germany | 23.83 | |
| 7 | Mark Foster | Great Britain | 23.86 | |
| 8 | Fernando Scherer | Brazil | 23.96 | |

### Semifinals

| Rank | Heat + Lane | Swimmer | Nation | Time | Notes |
| 1 | S2 L4 | Ian Crocker | USA | 23.47 | q |
| 2 | S1 L4 | Geoff Huegill | Australia | 23.61 | q |
| 3 | S1 L5 | Thomas Rupprath | Germany | 23.75 | q |
| 4 | S1 L1 | Mark Foster | Great Britain | 23.76 | q |
| 5 | S1 L3 | Fernando Scherer | Brazil | 23.86 | q |
| 5 | S2 L5 | Evgueni Korotychkine | Russia | 23.86 | q |
| 7 | S2 L7 | Roland Schoeman | South Africa | 23.88 | q |
| 8 | S1 L7 | Matt Welsh | Australia | 23.91 | q |
| 9 | S1 L6 | Mike Mintenko | Canada | 23.97 | q |
| 10 | S1 L2 | Lars Frölander | Sweden | 23.98 | q |
| 11 | S2 L1 | Sergiy Breus | Ukraine | 24.03 | q |
| 12 | S2 L6 | Jere Hård | Finland | 24.09 | q |
| 12 | S2 L3 | Andrii Serdinov | Ukraine | 24.09 | q |
| 14 | S2 L2 | Joris Keizer | Netherlands | 24.16 | q |
| 15 | S2 L8 | Ryo Takayasu | Japan | 24.41 | q |
| 16 | S1 L8 | Zsolt Gáspár | Hungary | 24.43 | q |

### Preliminaries

| Rank | Heat+Lane | Swimmer | Nation | Time | Notes |
| 1 | H14 L6 | Ian Crocker | United States | 23.73 | q |
| 2 | H15 L4 | Geoff Huegill | Australia | 23.75 | q |
| 2 | H16 L3 | Evgueni Korotychkine | Russia | 23.75 | q |
| 4 | H15 L5 | Thomas Rupprath | Germany | 23.76 | q |
| 5 | H16 L6 | Andrii Serdinov | Ukraine | 23.90 | q |
| 6 | H15 L6 | Fernando Scherer | Brazil | 24.04 | q |
| 7 | H16 L4 | Jere Hård | Finland | 24.12 | q |
| 8 | H15 L2 | Mike Mintenko | Canada | 24.14 | q |
| 9 | H16 L5 | Joris Keizer | Netherlands | 24.16 | q |
| 10 | H14 L5 | Lars Frölander | Sweden | 24.17 | q |
| 11 | H14 L4 | Roland Schoeman | South Africa | 24.21 | q |
| 12 | H15 L3 | Matt Welsh | Australia | 24.23 | q |
| 13 | H14 L2 | Sergiy Breus | Ukraine | 24.28 | q |
| 14 | H14 L3 | Mark Foster | Great Britain | 24.34 | q |
| 15 | H16 L8 | Ryo Takayasu | Japan | 24.43 | q |
| 16 | H16 L2 | Zsolt Gáspár | Hungary | 24.44 | q |
| 17 | H12 L4 | Tero Välimaa | Finland | 24.45 | |
| 18 | H16 L7 | Igor Marchenko | Russia | 24.47 | |
| 19 | H12 L1 | Neil Walker | United States | 24.51 | |
| 20 | H05 L3 | Ricardo Busquets | Puerto Rico | 24.52 | |
| 21 | H15 L8 | Josh Ilika | Mexico | 24.53 | |
| 22 | H13 L4 | Ales Volcansek | Croatia | 24.59 | |
| 23 | H13 L7 | Ryan Pini | Papua New Guinea | 24.61 | |
| 24 | H12 L6 | Petter Sjødal | Norway | 24.66 | |
| 25 | H13 L5 | Takashi Yamamoto | Japan | 24.67 | |
| 26 | H13 L3 | Eugene Botes | South Africa | 24.70 | |
| 27 | H13 L6 | Mattia Nalesso | Italy | 24.72 | |
| 28 | H11 L5 | Octavio Alesi | Venezuela | 24.75 | |
| 29 | H14 L7 | Apostolos Tsagkarakis | Greece | 24.76 | |
| 30 | H13 L8 | Danil Haustov | Estonia | 24.77 | |
| 31 | H15 L7 | Corney Swanepoel | New Zealand | 24.80 | |
| 32 | H15 L1 | Simão Morgado | Portugal | 24.82 | |
| 33 | H14 L1 | Ravil Nachaev | Uzbekistan | 24.83 | |
| 34 | H12 L5 | Camilo Becerra | Colombia | 24.86 | |
| 35 | H13 L2 | Pavel Lagoun | Belarus | 24.89 | |
| 36 | H13 L1 | Erik Andersson | Sweden | 24.94 | |
| 37 | H12 L7 | Luc Decker | Luxembourg | 25.05 | |
| 37 | H16 L1 | Pablo Martín Abal | Argentina | 25.05 | |
| 39 | H12 L2 | Julio Santos | Ecuador | 25.12 | |
| 40 | H14 L8 | Nicholas Santos | Brazil | 25.15 | |
| 41 | H12 L3 | Ioan Gherghel | Romania | 25.16 | |
| 42 | H12 L8 | Georgi Palazov | Bulgaria | 25.17 | |
| 43 | H07 L7 | Mihály Flaskay | Hungary | 25.23 | |
| 44 | H10 L2 | Zoran Lazarovski | Macedonia | 25.26 | |
| 45 | H10 L8 | Guntars Deicmans | Latvia | 25.34 | |
| 46 | H11 L6 | Rimvydas Šalčius | Lithuania | 25.37 | |
| 47 | H11 L2 | Aleksandar Miladinovski | Macedonia | 25.43 | |
| 48 | H10 L6 | Jeong Doo-Hee | South Korea | 25.44 | |
| 49 | H11 L4 | Nicholas Rees | Bahamas | 25.45 | |
| 50 | H10 L4 | Pedro Silva | Portugal | 25.53 | |
| 51 | H11 L7 | Oleg Lyashko | Uzbekistan | 25.55 | |
| 52 | H01 L2 | Huazhang Zheng | China | 25.63 | |
| 53 | H11 L3 | Stavros Michaelides | Cyprus | 25.64 | |
| 54 | H09 L3 | Wing Cheung Victor Wong | Macau | 25.66 | |
| 55 | H11 L8 | Orel Oral | Turkey | 25.71 | |
| 56 | H11 L1 | Rustam Khudiyev | Kazakhstan | 25.75 | |
| 57 | H10 L3 | Ken Tomson | Estonia | 25.84 | |
| 58 | H10 L5 | Conrad Francis | Sri Lanka | 25.92 | |
| 59 | H07 L1 | Ismael Ortiz | Panama | 26.09 | |
| 60 | H08 L5 | Jorge Arce | Costa Rica | 26.13 | |
| 61 | H10 L1 | Yu Lung Lubrey Lim | Malaysia | 26.20 | |
| 62 | H08 L4 | Nicholas Bovell | Trinidad and Tobago | 26.21 | |
| 63 | H08 L3 | Musa Bakare | Nigeria | 26.25 | |
| 64 | H09 L4 | Cliff Gittens | Barbados | 26.27 | |
| 65 | H09 L6 | Ignacio Sanchez Leon | Peru | 26.34 | |
| 66 | H07 L8 | Miguel Navarro | Bolivia | 26.42 | |
| 67 | H09 L1 | Carles Ridaura | Andorra | 26.48 | |
| 68 | H06 L2 | Abed Rahman Kaaki | Lebanon | 26.53 | |
| 69 | H07 L2 | Gunther Streit | Namibia | 26.58 | |
| 70 | H07 L6 | Gregory Arkhurst | Ivory Coast | 26.61 | |
| 71 | H06 L3 | Rama Vyombo | Kenya | 26.63 | |
| 72 | H08 L6 | Ayoub Al-Mas | United Arab Emirates | 26.70 | |
| 72 | H09 L8 | Gordon Touw Ngie Tjouw | Suriname | 26.70 | |
| 74 | H08 L8 | James Walsh | Philippines | 26.71 | |
| 75 | H06 L5 | William Muriel | Ecuador | 26.73 | |
| 76 | H06 L4 | Gustavo Adolfo Martinez | Honduras | 26.77 | |
| 77 | H09 L2 | Shui Ki Szeto | Hong Kong | 26.78 | |
| 78 | H06 L1 | Davy Bisslik | Aruba | 26.79 | |
| 78 | H08 L2 | Zurab Khomasuridze | Georgia | 26.79 | |
| 80 | H10 L7 | Aloïs Dansou | Benin | 26.83 | |
| 81 | H06 L8 | Kenny Roberts | Seychelles | 26.88 | |
| 82 | H07 L3 | Chad Miller | Fiji | 26.91 | |
| 83 | H09 L7 | Fadi Jalabi | Syria | 26.96 | |
| 84 | H07 L5 | Jean Paul Adam | Seychelles | 27.00 | |
| 85 | H08 L1 | Nedim Nišić | Bosnia and Herzegovina | 27.01 | |
| 86 | H05 L5 | Khaly Ciss | Senegal | 27.08 | |
| 87 | H09 L5 | Jewel Ahmed | Bangladesh | 27.21 | |
| 88 | H06 L6 | Rafael de Leon Alfaro | Guatemala | 27.24 | |
| 89 | H05 L4 | Yann Lausan | Tahiti | 27.31 | |
| 90 | H05 L1 | Kuan Fong Lao | Macau | 27.33 | |
| 91 | H05 L7 | João Aguiar | Angola | 27.51 | |
| 92 | H04 L7 | Ranui Teriipaia | Tahiti | 27.68 | |
| 93 | H04 L4 | Sean Chow | Fiji | 27.73 | |
| 94 | H04 L3 | Dean Palacios | Northern Mariana Islands | 27.91 | |
| 95 | H03 L6 | Ilidio Matusse | Mozambique | 27.93 | |
| 96 | H05 L2 | Zaid Almarafi | Jordan | 27.98 | |
| 97 | H02 L5 | Anderson Bonabart | Federated States of Micronesia | 28.07 | |
| 98 | H04 L8 | Aung Kyaw Moe | Myanmar | 28.19 | |
| 99 | H03 L8 | Ibrahim Maliki | Niger | 28.30 | |
| 99 | H04 L5 | Clark Randrianandraina | Madagascar | 28.30 | |
| 99 | H05 L6 | Zaid K. Saeed | Iraq | 28.30 | |
| 102 | H04 L1 | Yan Lin Aung | Myanmar | 28.41 | |
| 103 | H06 L7 | Rad Aweisat | Palestine | 28.43 | |
| 104 | H03 L2 | Connor Keith | Guam | 28.58 | |
| 105 | H03 L4 | Fernando Medrano | Nicaragua | 28.67 | |
| 106 | H04 L6 | Omar Núñez | Nicaragua | 28.78 | |
| 107 | H05 L8 | Nuno Rola | Angola | 28.82 | |
| 108 | H03 L3 | Rony Bakale | Republic of the Congo | 28.90 | |
| 109 | H03 L7 | Muzeya Muzyamba | Zambia | 29.13 | |
| 110 | H01 L3 | Hassan Mubah | Maldives | 29.77 | |
| 111 | H03 L5 | Marzoyq Al Salem | Kuwait | 29.98 | |
| 112 | H02 L6 | Sikhounxay Ounkhamphanyavong | Laos | 30.06 | |
| 113 | H03 L1 | Enkhmandakh Khurlee | Mongolia | 30.33 | |
| 114 | H02 L3 | Edgar Luberenga | Uganda | 30.60 | |
| 115 | H02 L4 | Gilbert Kaburu | Uganda | 31.47 | |
| 116 | H02 L7 | Chisela Kanchela | Zambia | 31.81 | |
| 117 | H02 L1 | Joshua Marfleet | Samoa | 31.83 | |
| 118 | H02 L2 | Sarmad A.A. Mohamad | Iraq | 32.03 | |
| - | H02 L8 | Ali Maiga Akibou | Niger | DQ | |
| - | - | Ayoub Salem Mallalah | United Arab Emirates | DNS | |
| - | - | Ahmed Ouattara Zie | Ivory Coast | DNS | |
| - | - | Issam Halawani | Palestine | DNS | |
| - | - | Maximilien J. Doualla Frederic | Cameroon | DNS | |
| - | - | Sadrack Franklin Massok | Cameroon | DNS | |
| - | - | Emery Nziyunvira | Burundi | DNS | |