# Swimming at the 2011 World Aquatics Championships – Men's 100 metre freestyle

The men's 100 metre freestyle competition of the swimming events at the 2011 World Aquatics Championships was held on July 27 with the heats and the semifinals and July 28 with the finale.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record Championship record | César Cielo | Brazil | 46.91 | Rome | July 30, 2009 |

## Results
### Heats

106 swimmers participated in 14 heats.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 12 | 3 | William Meynard | France | 48.14 | Q |
| 2 | 13 | 5 | James Magnussen | Australia | 48.21 | Q |
| 3 | 14 | 2 | Filippo Magnini | Italy | 48.36 | Q |
| 4 | 12 | 4 | César Cielo | Brazil | 48.41 | Q |
| 5 | 12 | 5 | Fabien Gilot | France | 48.48 | Q |
| 6 | 13 | 6 | Andrey Grechin | Russia | 48.59 | Q |
| 7 | 13 | 7 | Sebastiaan Verschuren | Netherlands | 48.60 | Q |
| 8 | 13 | 4 | Nathan Adrian | United States | 48.62 | Q |
| 9 | 14 | 1 | Graeme Moore | South Africa | 48.65 | Q |
| 10 | 11 | 4 | Gideon Louw | South Africa | 48.74 | Q |
| 11 | 14 | 4 | Brent Hayden | Canada | 48.75 | Q |
| 12 | 12 | 6 | Nikita Lobintsev | Russia | 48.78 | Q |
| 13 | 14 | 6 | Luca Dotto | Italy | 48.79 | Q |
| 14 | 13 | 2 | Park Tae-Hwan | South Korea | 48.91 | Q |
| 15 | 12 | 7 | Konrad Czerniak | Poland | 48.92 | Q |
| 16 | 14 | 7 | James Roberts | Australia | 48.93 | Q |
| 17 | 10 | 8 | Brett Fraser | Cayman Islands | 48.98 | |
| 18 | 10 | 5 | Hanser García | Cuba | 48.99 | |
| 19 | 14 | 5 | Marco di Carli | Germany | 49.00 | |
| 20 | 14 | 3 | Jason Lezak | United States | 49.03 | |
| 21 | 12 | 1 | Adam Brown | Great Britain | 49.13 | |
| 21 | 14 | 8 | Takuro Fujii | Japan | 49.13 | |
| 23 | 9 | 4 | David Dunford | Kenya | 49.20 | |
| 24 | 12 | 2 | Bruno Fratus | Brazil | 49.23 | |
| 25 | 13 | 3 | Simon Burnett | Great Britain | 49.25 | |
| 26 | 12 | 8 | Lü Zhiwu | China | 49.26 | |
| 27 | 11 | 3 | Dominik Kozma | Hungary | 49.49 | |
| 28 | 11 | 2 | Martin Verner | Czech Republic | 49.52 | |
| 29 | 10 | 6 | Mindaugas Sadauskas | Lithuania | 49.66 | |
| 30 | 11 | 8 | Odysseas Meladinis | Greece | 49.71 | |
| 31 | 11 | 1 | Jasper Aerents | Belgium | 49.75 | |
| 32 | 13 | 1 | Stefan Nystrand | Sweden | 49.80 | |
| 33 | 10 | 7 | Nabil Kebbab | Algeria | 49.85 | |
| 34 | 10 | 4 | Flori Lang | Switzerland | 49.86 | |
| 35 | 11 | 6 | Nimrod Shapira Bar-Or | Israel | 49.91 | |
| 36 | 10 | 2 | Ben Hockin | Paraguay | 50.03 | |
| 37 | 11 | 7 | Velimir Stjepanović | Serbia | 50.14 | |
| 38 | 10 | 3 | Mario Todorović | Croatia | 50.16 | |
| 38 | 11 | 5 | Jiang Haiqi | China | 50.16 | |
| 40 | 10 | 1 | Crox Ernesto Acuna | Venezuela | 50.28 | |
| 41 | 9 | 2 | Gabriel Melconian | Uruguay | 50.34 | |
| 41 | 9 | 5 | Virdhaval Vikram Khade | India | 50.34 | |
| 41 | 9 | 7 | Ryan Pini | Papua New Guinea | 50.34 | |
| 44 | 8 | 1 | Uvis Kalnins | Latvia | 50.46 | |
| 45 | 9 | 3 | Alexandre Agostinho | Portugal | 50.71 | |
| 46 | 7 | 4 | Branden Whitehurst | U.S. Virgin Islands | 50.95 | |
| 47 | 7 | 5 | Roy-Allan Burch | Bermuda | 51.01 | NR |
| 48 | 8 | 7 | Sidni Hoxha | Albania | 51.51 | |
| 49 | 8 | 4 | Ensar Hajder | Bosnia and Herzegovina | 51.52 | |
| 50 | 9 | 6 | Matias Aguilera | Argentina | 51.62 | |
| 51 | 8 | 5 | Charles William Walker | Philippines | 51.72 | |
| 52 | 8 | 8 | Ivars Akmentins | Latvia | 51.89 | |
| 53 | 8 | 6 | Shebab Younis | Egypt | 51.95 | |
| 54 | 7 | 8 | Amine Kouame | Morocco | 52.05 | NR |
| 55 | 9 | 1 | Hoàng Quý Phước | Vietnam | 52.11 | |
| 56 | 8 | 2 | Mohammad Bidarian | Iran | 52.42 | |
| 57 | 6 | 5 | Luke Hall | Eswatini | 52.45 | |
| 58 | 7 | 7 | Jemal le Grand | Aruba | 52.62 | |
| 59 | 6 | 7 | Quinton Delie | Namibia | 52.74 | |
| 60 | 6 | 4 | José Montoya | Costa Rica | 52.96 | |
| 61 | 7 | 2 | Kevin Avila | Guatemala | 53.03 | |
| 62 | 8 | 3 | Mohamed Madouh | Kuwait | 53.07 | |
| 63 | 9 | 8 | Phạm Thành Nguyện | Vietnam | 53.10 | |
| 64 | 7 | 6 | Mikael Koloyan | Armenia | 53.12 | |
| 65 | 6 | 6 | Gerard Baldrich Pujol | Andorra | 53.21 | NR |
| 66 | 7 | 1 | Christopher Duenas | Guam | 53.33 | |
| 67 | 6 | 8 | Andrew Rutherfurd | Bolivia | 53.57 | |
| 68 | 5 | 8 | Esau Simpson | Grenada | 53.85 | |
| 69 | 6 | 3 | Kareem Ennab | Jordan | 53.92 | |
| 70 | 6 | 2 | Nicholas Coard | Grenada | 53.94 | |
| 71 | 6 | 1 | Mahfizur Rahman Sagor | Bangladesh | 54.18 | |
| 72 | 5 | 4 | Anthony Clark | French Polynesia | 54.51 | |
| 73 | 5 | 2 | Abbas Raad | Lebanon | 54.91 | |
| 74 | 5 | 1 | Niall Roberts | Guyana | 54.99 | |
| 74 | 5 | 3 | Chakyl Camal | Mozambique | 54.99 | |
| 74 | 5 | 7 | Julien Brice | Saint Lucia | 54.99 | |
| 77 | 4 | 3 | Sergey Krovyakov | Turkmenistan | 55.99 | |
| 78 | 4 | 2 | Douglas Miller | Fiji | 56.06 | |
| 79 | 5 | 6 | Sofyan El Gadi | Libya | 56.45 | |
| 80 | 4 | 4 | Omar Núñez | Nicaragua | 56.76 | |
| 81 | 4 | 1 | Christian Nikles | Brunei | 57.44 | |
| 82 | 5 | 5 | Tamir Andrei | Mongolia | 57.52 | |
| 83 | 4 | 7 | Israr Hussain | Pakistan | 57.69 | |
| 84 | 4 | 5 | Shane Mangroo | Seychelles | 57.85 | |
| 85 | 4 | 8 | Mamadou Soumare | Mali | 58.21 | |
| 86 | 4 | 6 | Tepaia Payne | Cook Islands | 58.59 | |
| 87 | 3 | 5 | Atta Tano Claver | Ivory Coast | 59.70 | |
| 88 | 3 | 1 | Husam Ahmed | Maldives | 59.98 | |
| 89 | 3 | 2 | Inayath Hassan | Maldives | 1:01.75 | |
| 90 | 2 | 6 | Farhan Farhan | Bahrain | 1:01.76 | |
| 91 | 3 | 6 | Zangan Gunsennorou | Mongolia | 1:01.80 | |
| 92 | 2 | 4 | Prasiddha Jung Shah | Nepal | 1:01.84 | |
| 93 | 3 | 7 | Shailesh Shumsher Rana | Nepal | 1:01.94 | |
| 94 | 3 | 4 | Dionisio Augustine II | Micronesia | 1:02.41 | |
| 95 | 2 | 2 | Shawn Wallace | Palau | 1:02.53 | |
| 95 | 2 | 1 | Giordan Harris | Marshall Islands | 1:02.53 | |
| 97 | 2 | 3 | Fdingue Ekane | Cameroon | 1:02.65 | |
| 98 | 2 | 5 | Beni-Bertrand Binobagira | Burundi | 1:03.39 | |
| 99 | 3 | 8 | Ammaar Ghadiyali | Tanzania | 1:03.98 | |
| 100 | 3 | 3 | Athoumani Youssouf | Comoros | 1:04.75 | |
| 101 | 1 | 4 | Amadou Camara | Guinea | 1:06.25 | |
| 102 | 2 | 7 | Kyle Zreibe | Antigua and Barbuda | 1:07.35 | |
| 103 | 1 | 6 | Daniel Langinbelik | Marshall Islands | 1:12.52 | |
| 104 | 1 | 3 | Godonou Wilfrid Tevoedjre | Benin | 1:14.08 | |
| 105 | 2 | 8 | Janvier Niyonkuru | Burundi | 1:16.00 | |
| - | 1 | 5 | Ahmed Chawali | Comoros | | DSQ |
| - | 7 | 3 | Brad Hamilton | Jamaica | | DNS |
| - | 13 | 8 | Markus Deibler | Germany | | DNS |

### Semifinals

The semifinals were held at 18:02.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | James Magnussen | Australia | 47.90 | Q |
| 2 | 6 | Nathan Adrian | United States | 48.05 | Q |
| 3 | 5 | César Cielo | Brazil | 48.34 | Q |
| 4 | 8 | James Roberts | Australia | 48.49 | |
| 5 | 3 | Andrey Grechin | Russia | 48.67 | |
| 6 | 1 | Park Tae-Hwan | South Korea | 48.86 | |
| 7 | 2 | Gideon Louw | South Africa | 48.96 | |
| 8 | 7 | Nikita Lobintsev | Russia | 49.00 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | William Meynard | France | 48.25 | Q |
| 2 | 7 | Brent Hayden | Canada | 48.30 | Q |
| 3 | 6 | Sebastiaan Verschuren | Netherlands | 48.41 | Q |
| 4 | 1 | Luca Dotto | Italy | 48.44 | Q |
| 5 | 3 | Fabien Gilot | France | 48.46 | Q |
| 6 | 8 | Konrad Czerniak | Poland | 48.48 | |
| 7 | 5 | Filippo Magnini | Italy | 48.50 | |
| 8 | 2 | Graeme Moore | South Africa | 48.59 | |

### Final

The final was held at 18.35.
| Rank | Lane | Name | Nationality | Time |
| | 4 | James Magnussen | Australia | 47.63 |
| | 6 | Brent Hayden | Canada | 47.95 |
| | 3 | William Meynard | France | 48.00 |
| 4 | 2 | César Cielo | Brazil | 48.01 |
| 5 | 8 | Fabien Gilot | France | 48.13 |
| 6 | 5 | Nathan Adrian | United States | 48.23 |
| 7 | 1 | Luca Dotto | Italy | 48.24 |
| 8 | 7 | Sebastiaan Verschuren | Netherlands | 48.27 |