# Swimming at the 2005 World Aquatics Championships – Men's 100 metre backstroke

The men's 100 metre backstroke event at the 2005 World Aquatics Championships took place between 25 July – 26 July. Both the heats and semifinals were held on 25 July with the heats being held in the morning session and the semifinals being held in the evening session. The final was held on 26 July.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Name | Nationality | Time | Location | Date |
| World record | Aaron Peirsol | United States | 53.17 | Indianapolis | 2 April 2005 |
| Championship record | Aaron Peirsol | United States | 53.61 | Barcelona | 22 July 2003 |
No new world or competition records were set during this competition.

## Results
### Preliminary heats

| Rank | Heat/Lane | Swimmer | Nationality | Time | Notes |
| 1 | H10 L4 | Aaron Peirsol | United States | 54.41 | q |
| 2 | H10 L3 | Aristeidis Grigoriadis | Greece | 54.84 | q |
| 3 | H9 L4 | Randall Bal | United States | 54.88 | q |
| 3 | H10 L2 | Andrew Lauterstein | Australia | 54.88 | q |
| 5 | H8 L5 | László Cseh | Hungary | 54.89 | q |
| 6 | H8 L4 | Markus Rogan | Austria | 54.97 | q |
| 7 | H9 L2 | Blaž Medvešek | Slovenia | 55.03 | q |
| 8 | H8 L6 | Junichi Miyashita | Japan | 55.05 | q |
| 9 | H9 L3 | Arkady Vyatchanin | Russia | 55.14 | q |
| 10 | H9 L7 | Răzvan Florea | Romania | 55.15 | q |
| 11 | H10 L1 | Gordan Kožulj | Croatia | 55.20 | q |
| 12 | H10 L6 | Steffen Driesen | Germany | 55.25 | q |
| 13 | H9 L5 | Matt Welsh | Australia | 55.40 | q |
| 14 | H8 L2 | Liam Tancock | Great Britain | 55.47 | q |
| 15 | H10 L5 | Tomomi Morita | Japan | 55.51 | q |
| 16 | H9 L1 | David Ortega | Spain | 55.52 | q |
| 17 | H9 L6 | James Goddard | Great Britain | 55.66 | |
| 18 | H7 L6 | Vytautas Janušaitis | Lithuania | 55.83 | |
| 19 | H10 L7 | Alex Lim | Malaysia | 55.88 | |
| 20 | H8 L3 | Marco di Carli | Germany | 55.95 | |
| 21 | H8 L8 | Scott Talbot | New Zealand | 56.07 | |
| 22 | H8 L7 | Simon Dufour | France | 56.10 | |
| 23 | H7 L4 | Cameron Gibson | New Zealand | 56.49 | |
| 23 | H7 L5 | Nick Neckles | Barbados | 56.49 | |
| 25 | H7 L1 | Pavel Suskov | Lithuania | 56.50 | |
| 26 | H8 L1 | Pavlo Illichov | Ukraine | 56.58 | |
| 27 | H6 L4 | Gabriel Mangabeira | Brazil | 56.64 | |
| 28 | H7 L8 | Yoav Gath | Israel | 56.79 | |
| 29 | H7 L3 | Derya Büyükuncu | Turkey | 56.81 | |
| 30 | H7 L7 | Tomasz Rumianowski | Poland | 56.86 | |
| 31 | H9 L8 | Pierre Roger | France | 56.92 | |
| 32 | H10 L8 | Aschwin Wildeboer | Spain | 57.28 | |
| 33 | H7 L2 | Örn Arnarson | Iceland | 57.43 | |
| 34 | H5 L4 | Garth Tune | South Africa | 57.83 | |
| 35 | H6 L1 | Seung-Hyeon Lee | South Korea | 58.11 | |
| 36 | H6 L5 | Chris Vythoulkas | Bahamas | 58.88 | |
| 37 | H6 L7 | Suriya Suksuphak | Thailand | 59.17 | |
| 38 | H5 L8 | Alessio Domenack | Peru | 59.69 | |
| 39 | H4 L5 | Jared Heine | Marshall Islands | 59.76 | |
| 40 | H6 L3 | Danil Bugakov | Uzbekistan | 59.86 | |
| 41 | H5 L6 | Rony Bakale | Republic of the Congo | 59.92 | |
| 42 | H6 L8 | Mark Chay | Singapore | 1:00.10 | |
| 43 | H4 L3 | Shawn Clarke | Barbados | 1:00.15 | |
| 44 | H5 L2 | Andy Wibowo | Indonesia | 1:00.65 | |
| 45 | H5 L3 | Oleg Pukhnatiy | Uzbekistan | 1:00.98 | |
| 46 | H4 L2 | Jason Dunford | Kenya | 1:01.01 | |
| 47 | H4 L4 | Zhi Cong Lim | Singapore | 1:01.05 | |
| 48 | H6 L6 | Martin Verner | Czech Republic | 1:01.09 | |
| 49 | H4 L7 | Kieran Locke | Virgin Islands | 1:01.25 | |
| 50 | H6 L2 | Yury Zaharov | Kyrgyzstan | 1:01.31 | |
| 51 | H4 L6 | David Dunford | Kenya | 1:01.52 | |
| 52 | H5 L5 | Guntars Deicmans | Latvia | 1:01.57 | |
| 53 | H4 L1 | Gael Adam | Mauritius | 1:01.60 | |
| 54 | H3 L3 | Francisco Montenegro | Guatemala | 1:01.94 | |
| 55 | H1 L3 | Onan Orlando Thom | Guyana | 1:02.47 | |
| 56 | H3 L4 | Shahin Baradaran | Iran | 1:02.48 | |
| 57 | H4 L8 | LIN Yu-An | Chinese Taipei | 1:02.74 | |
| 58 | H3 L5 | Andrei Mihailov | Moldova | 1:02.86 | |
| 59 | H3 L6 | Khaly Ciss | Senegal | 1:02.95 | |
| 60 | H3 L2 | Chi Lon Lei | Macau | 1:03.15 | |
| 61 | H5 L1 | Francois Ghattas | Lebanon | 1:03.30 | |
| 62 | H3 L7 | Daniel Carrillo | Paraguay | 1:03.43 | |
| 63 | H3 L1 | Antonio Tong | Macau | 1:03.45 | |
| 64 | H2 L1 | Horacio Carcamo | Honduras | 1:03.71 | |
| 65 | H2 L2 | Yassir Abdalla | Bolivia | 1:03.74 | |
| 66 | H2 L5 | Diego Foianini | Bolivia | 1:05.25 | |
| 67 | H5 L7 | Romulo Pereira | Angola | 1:05.29 | |
| 68 | H2 L3 | Julio Rivera | Honduras | 1:05.54 | |
| 69 | H2 L7 | Imdad Ali | Pakistan | 1:06.17 | |
| 70 | H2 L4 | Ganbold Urnultsaikhan | Mongolia | 1:07.28 | |
| 71 | H2 L8 | Andrey Molchanov | Turkmenistan | 1:08.23 | |
| 72 | H1 L5 | Alain Brigion-Tobe | Cameroon | 1:08.79 | |
| - | H1 L4 | Jonathan Calderon | Saint Lucia | DNS | |
| - | H2 L6 | Leonel Matonse | Mozambique | DNS | |

### Semifinals

| Rank | Heat/Lane | Swimmer | Nationality | Time | Notes |
| 1 | S2 L4 | Aaron Peirsol | USA | 54.46 | q |
| 2 | S2 L5 | Randall Bal | USA | 54.49 | q |
| 2 | S2 L8 | Tomomi Morita | Japan | 54.49 | q |
| 4 | S2 L3 | László Cseh | Hungary | 54.52 | q |
| 4 | S2 L2 | Arkady Vyatchanin | Russia | 54.52 | q |
| 6 | S1 L4 | Aristeidis Grigoriadis | Greece | 54.69 | q |
| 7 | S1 L3 | Markus Rogan | Austria | 54.75 | q |
| 8 | S2 L6 | Blaž Medvešek | Slovenia | 54.88 | q |
| 9 | S2 L1 | Matt Welsh | Australia | 54.89 | |
| 10 | S1 L1 | Liam Tancock | Great Britain | 55.07 | |
| 11 | S2 L7 | Gordan Kožulj | Croatia | 55.08 | |
| 12 | S1 L2 | Răzvan Florea | Romania | 55.34 | |
| 13 | S1 L7 | Steffen Driesen | Germany | 55.37 | |
| 14 | S1 L5 | Andrew Lauterstein | Australia | 55.43 | |
| 15 | S1 L6 | Junichi Miyashita | Japan | 55.44 | |
| 16 | S1 L8 | David Ortega | Spain | 55.73 | |

### Final

| Rank | Name | Nationality | Time |
| | Aaron Peirsol | USA | 53.62 |
| | Randall Bal | USA | 54.02 |
| | László Cseh | Hungary | 54.27 |
| 4 | Tomomi Morita | Japan | 54.31 |
| 5 | Arkady Vyatchanin | Russia | 54.50 |
| 6 | Aristeidis Grigoriadis | Greece | 54.61 |
| 7 | Markus Rogan | Austria | 54.81 |
| 8 | Blaž Medvešek | Slovenia | 55.13 |