# Swimming at the 2007 World Aquatics Championships – Men's 100 metre backstroke

The men's 100 metre backstroke at the 2007 World Aquatics Championships took place on 26 March (heats and semifinals) and the evening of 27 March (final) at the Rod Laver Arena in Melbourne, Australia. 92 swimmers were entered in the event, of which 90 swam.
Existing records at the start of the event were:
* World record (WR): 53.17, Aaron Peirsol (USA), 2 April 2005 in Indianapolis, Indiana, USA.
* Championship record (CR): 53.61, Aaron Peirsol (USA), Barcelona 2003 (22 July 2003)

## Results
### Final

| Place | Lane | Name | Nationality | 50m Split | Time |
| | 3 | Aaron Peirsol | United States | 25.80 | 52.98 WR |
| | 4 | Ryan Lochte | United States | 25.77 | 53.50 |
| | 5 | Liam Tancock | United Kingdom | 25.68 | 53.61 |
| 4 | 2 | Arkady Vyatchanin | Russia | 26.40 | 53.69 |
| 5 | 6 | Markus Rogan | Austria | 26.58 | 53.78 |
| 6 | 7 | Gerhard Zandberg | South Africa | 26.07 | 54.59 |
| 7 | 8 | Matt Welsh | Australia | 26.61 | 54.65 |
| 8 | 1 | Tomomi Morita | Japan | 26.47 | 55.04 |

### Semifinals

| Rank | Heat Lane | Name | Nationality | 50m split | Time | Notes |
| 1 | S2 L2 | Ryan Lochte | United States | 25.80 | 53.51 CR | Q |
| 2 | S1 L4 | Liam Tancock | Great Britain | 25.85 | 53.71 | Q |
| 3 | S1 L5 | Aaron Peirsol | United States | 26.08 | 53.92 | Q |
| 4 | S2 L4 | Markus Rogan | Austria | 26.24 | 53.98 | Q |
| 5 | S1 L3 | Arkady Vyatchanin | Russia | 26.89 | 54.30 | Q |
| 6 | S2 L5 | Gerhard Zandberg | South Africa | 26.29 | 54.54 | Q |
| 7 | S2 L6 | Tomomi Morita | Japan | 26.48 | 54.77 | Q |
| 8 | S2 L1 | Matt Welsh | Australia | 26.63 | 54.92 | Q |
| 8.5 | S1.5 | | | | 54.95 | O |
| 9 | S2 L8 | Steffen Driesen | Germany | 26.58 | 54.97 | |
| 10 | S1 L1 | Răzvan Florea | Romania | 26.61 | 55.02 | |
| 11 | S2 L3 | Aristeidis Grigoriadis | Greece | 26.56 | 55.12 | |
| 12 | S1 L7 | Thiago Pereira | Brazil | 27.01 | 55.30 | |
| 13 | S1 L6 | Matthew Clay | Great Britain | 26.20 | 55.32 | |
| 14 | S2 L7 | Masafumi Yamaguchi | Japan | 26.59 | 55.34 | |
| 15 | S1 L2 | Helge Meeuw | Germany | 26.95 | 55.37 | |
| 16 | S1 L8 | Hayden Stoeckel | Australia | 27.11 | 55.51 | |

### Heats

| Rank | Heat Lane | Name | Nationality | 50m split | Time | Notes |
| 1 | H10 L5 | Markus Rogan | Austria | 26.89 | 00:54.34 | Q |
| 2 | H11 L3 | Liam Tancock | Great Britain | 25.65 | 00:54.54 | Q |
| 3 | H12 L7 | Gerhard Zandberg | South Africa | 26.47 | 00:54.83 | Q |
| 4 | H12 L4 | Aaron Peirsol | United States | 26.66 | 00:54.88 | Q |
| 5 | H12 L3 | Aristeidis Grigoriadis | Greece | 26.31 | 00:54.95 | Q |
| 6 | H10 L4 | Arkady Vyatchanin | Russia | 27.38 | 00:55.00 | Q |
| 7 | H11 L5 | Tomomi Morita | Japan | 26.60 | 00:55.06 | Q |
| 8 | H10 L3 | Matthew Clay | Great Britain | 26.72 | 00:55.07 | Q |
| 9 | H12 L5 | Ryan Lochte | United States | 27.00 | 00:55.08 | Q |
| 10 | H11 L4 | Helge Meeuw | Germany | 26.55 | 00:55.11 | Q |
| 11 | H12 L6 | Masafumi Yamaguchi | Japan | 26.80 | 00:55.30 | Q |
| 12 | H09 L4 | Vytautas Janušaitis | Lithuania | 26.65 | 00:55.36 | Q |
| 13 | H09 L6 | Thiago Pereira | Brazil | 27.04 | 00:55.44 | Q |
| 14 | H12 L2 | Matt Welsh | Australia | 26.36 | 00:55.50 | Q |
| 15 | H10 L7 | Răzvan Florea | Romania | 26.82 | 00:55.53 | Q |
| 16 | H10 L6 | Steffen Driesen | Germany | 26.97 | 00:55.63 | Q |
| 16.5 | H09.5 | | | | 00:55.635 | O |
| 17 | H11 L2 | Hayden Stoeckel | Australia | 26.57 | 00:55.64 | |
| 18 | H11 L6 | Ouyang Kunpeng | China | 26.69 | 00:55.75 | |
| 19 | H09 L8 | Guy Barne'a | Israel | 26.83 | 00:55.88 | |
| 20 | H10 L1 | Damiano Lestingi | Italy | 27.46 | 00:56.07 | |
| 21 | H11 L1 | Ľuboš Križko | Slovakia | 26.93 | 00:56.13 | |
| 22 | H12 L1 | Evgeny Aleshin | Russia | 26.93 | 00:56.14 | |
| 23 | H11 L7 | Simon Dufour | France | 27.21 | 00:56.15 | |
| 24 | H10 L2 | Andriy Oleynyk | Ukraine | 27.37 | 00:56.18 | |
| 25 | H09 L3 | Nicholas Neckles | Barbados | 27.22 | 00:56.20 | |
| 26 | H11 L8 | Leonardo Guedes | Brazil | 27.19 | 00:56.42 | |
| 27 | H10 L8 | Derya Büyükuncu | Turkey | 27.37 | 00:56.50 | |
| 28 | H09 L5 | George du Rand | South Africa | 27.55 | 00:56.59 | |
| 29 | H09 L7 | Ehud Segal | Israel | 27.66 | 00:56.73 | |
| 30 | H12 L8 | Zhang Bodong | China | 27.28 | 00:56.87 | |
| 31 | H07 L4 | Pedro Oliveira | Portugal | 27.79 | 00:56.96 | |
| 32 | H08 L5 | Pavel Sankovich | Belarus | 27.42 | 00:57.09 | |
| 33 | H08 L4 | Flori Lang | Switzerland | 27.24 | 00:57.10 | |
| 34 | H09 L1 | Cameron Gibson | New Zealand | 27.58 | 00:57.40 | |
| 35 | H08 L6 | Mathias Gydesen | Denmark | 27.96 | 00:57.46 | |
| 36 | H08 L7 | Eduardo German Otero | Argentina | 27.49 | 00:57.50 | |
| 37 | H09 L2 | Ante Cvitkovic | Croatia | 28.09 | 00:57.57 | |
| 38 | H07 L3 | Tomas Fucik | Czech Republic | 27.89 | 00:57.69 | |
| 39 | H08 L8 | Seunghyeon Lee | South Korea | 27.80 | 00:58.08 | |
| 40 | H08 L2 | Stanislav Osinsky | Kazakhstan | 27.67 | 00:58.20 | |
| 41 | H08 L1 | Kim Torry Simmenes | Norway | 27.21 | 00:58.24 | |
| 42 | H08 L3 | Ivan Tolic | Croatia | 27.97 | 00:58.36 | |
| 43 | H07 L2 | Danil Bugakov | Uzbekistan | 28.20 | 00:58.74 | |
| 44 | H06 L8 | Taki Mrabet | Tunisia | 28.31 | 00:58.82 | |
| 45 | H07 L6 | David Dunford | Kenya | 28.31 | 00:58.86 | |
| 46 | H06 L6 | Miguel Robles | Mexico | 28.53 | 00:58.96 | |
| 47 | H07 L8 | Geoffrey Robin Cheah | Hong Kong | 28.64 | 00:59.15 | |
| 48 | H07 L1 | Ioannis Giannoulis | Greece | 28.71 | 00:59.22 | |
| 49 | H04 L2 | Felix Cristiadi Sutanto | Indonesia | 29.13 | 00:59.39 | |
| 50 | H06 L2 | Sergey Pankov | Uzbekistan | 29.17 | 00:59.99 | |
| 51 | H06 L4 | Jared Heine | Marshall Islands | 28.70 | 1:00.28 | |
| 52 | H07 L5 | Rony Bakale | Republic of the Congo | 29.06 | 1:00.44 | |
| 53 | H07 L7 | Iurii Zakharov | Kyrgyzstan | 29.03 | 1:00.64 | |
| 54 | H06 L3 | Suriya Suksuphak | Thailand | 29.37 | 1:00.73 | |
| 55 | H04 L3 | Giorgios Mylonas | Cyprus | 28.80 | 1:00.91 | |
| 56 | H06 L5 | Yu An Lin | Chinese Taipei | 29.17 | 1:00.95 | |
| 57 | H05 L2 | Sandeep Nagar Anthal | India | 29.81 | 1:00.98 | |
| 58 | H05 L7 | Zhi Cong Lim | Singapore | 29.69 | 1:01.09 | |
| 59 | H05 L4 | Gael Adam | Mauritius | 29.55 | 1:01.15 | |
| 60 | H05 L1 | Wei Shien Zach Ong | Singapore | 29.52 | 1:01.27 | |
| 61 | H05 L3 | Juan Montenegro | Guatemala | 30.12 | 1:01.36 | |
| 62 | H05 L5 | Shahin Baradaran Nakhjavani | Iran | 29.16 | 1:01.56 | |
| 63 | H04 L4 | Souhaib Kalala | Syria | 30.35 | 1:01.66 | |
| 64 | H05 L8 | Amine Kouam | Morocco | 29.65 | 1:01.78 | |
| 65 | H06 L7 | Mario Montoya | Costa Rica | 30.25 | 1:01.84 | |
| 66 | H03 L4 | Yousuf Alyousuf | Saudi Arabia | 30.45 | 1:01.87 | |
| 67 | H04 L7 | Carlos Eduardo Gil | Peru | 30.36 | 1:02.03 | |
| 68 | H01 L4 | Eric Chang | Malaysia | 29.82 | 1:02.32 | |
| 69 | H05 L6 | Arjun Muralidharan | India | 29.42 | 1:02.35 | |
| 70 | H02 L8 | Roy-Allan Burch | Bermuda | 29.33 | 1:02.72 | |
| 71 | H04 L6 | Heshan Unamboowe | Sri Lanka | 30.61 | 1:02.84 | |
| 72 | H04 L1 | Melvin Chua | Malaysia | 30.70 | 1:03.10 | |
| 73 | H03 L5 | Khaly Ciss | Senegal | 31.03 | 1:03.23 | |
| 74 | H03 L1 | Rainui Terupaia | Tahiti | 31.56 | 1:04.66 | |
| 75 | H04 L5 | Nuno Rola | Angola | 31.34 | 1:05.55 | |
| 76 | H04 L8 | Ahmed Salamoun | Qatar | 31.21 | 1:05.77 | |
| 77 | H02 L4 | Andrey Molchanov | Turkmenistan | 31.19 | 1:05.95 | |
| 77 | H03 L3 | Tural Abbasov | Azerbaijan | 30.79 | 1:05.95 | |
| 79 | H03 L6 | Fadi Awesat | Palestine | 31.62 | 1:06.20 | |
| 80 | H03 L8 | Kin Wa Cheong | Macau | 32.52 | 1:07.19 | |
| 81 | H03 L7 | Richard Randrianandraina | Madagascar | 32.43 | 1:08.73 | |
| 82 | H02 L5 | Celestino Aguon | Guam | 33.32 | 1:09.18 | |
| 83 | H02 L3 | Jamaal Sobers | Guyana | 32.80 | 1:10.05 | |
| 84 | H02 L6 | Timur Atahanov | Turkmenistan | 33.19 | 1:12.50 | |
| 85 | H01 L6 | Yannick Roberts | Guyana | 35.04 | 1:12.78 | |
| 86 | H02 L2 | Ali Zayeri | Brunei | 36.81 | 1:15.39 | |
| 87 | H02 L7 | Ibrahim Shameel | Maldives | 39.24 | 1:24.63 | |
| 88 | H02 L1 | Mohammed Al Qerbi | Yemen | 40.46 | 1:24.75 | |
| 89 | H01 L3 | Boipelo Makhothi | Lesotho | 42.61 | 1:32.14 | |
| 90 | H01 L5 | Thabiso Gilbert | Lesotho | 43.00 | 1:35.01 | |
| 999 | H03 L2 | Samson Opuakpo | Nigeria | 999 | DNS | |
| 999 | H06 L1 | Mohammad Rubel | Bangladesh | 999 | DNS | |