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 final.
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 | 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 | Q | ||
| 2 | 13 | 5 | James Magnussen | Q | ||
| 3 | 14 | 2 | Filippo Magnini | Q | ||
| 4 | 12 | 4 | César Cielo | Q | ||
| 5 | 12 | 5 | Fabien Gilot | Q | ||
| 6 | 13 | 6 | Andrey Grechin | Q | ||
| 7 | 13 | 7 | Sebastiaan Verschuren | Q | ||
| 8 | 13 | 4 | Nathan Adrian | Q | ||
| 9 | 14 | 1 | Graeme Moore | Q | ||
| 10 | 11 | 4 | Gideon Louw | Q | ||
| 11 | 14 | 4 | Brent Hayden | Q | ||
| 12 | 12 | 6 | Nikita Lobintsev | Q | ||
| 13 | 14 | 6 | Luca Dotto | Q | ||
| 14 | 13 | 2 | Park Tae-Hwan | Q | ||
| 15 | 12 | 7 | Konrad Czerniak | Q | ||
| 16 | 14 | 7 | James Roberts | Q | ||
| 17 | 10 | 8 | Brett Fraser | |||
| 18 | 10 | 5 | Hanser Garcia | |||
| 19 | 14 | 5 | Marco di Carli | |||
| 20 | 14 | 3 | Jason Lezak | |||
| 21 | 12 | 1 | Adam Brown | |||
| 21 | 14 | 8 | Takuro Fujii | |||
| 23 | 9 | 4 | David Dunford | |||
| 24 | 12 | 2 | Bruno Fratus | |||
| 25 | 13 | 3 | Simon Burnett | |||
| 26 | 12 | 8 | Lü Zhiwu | |||
| 27 | 11 | 3 | Dominik Kozma | |||
| 28 | 11 | 2 | Martin Verner | |||
| 29 | 10 | 6 | Mindaugas Sadauskas | |||
| 30 | 11 | 8 | Odysseas Meladinis | |||
| 31 | 11 | 1 | Jasper Aerents | |||
| 32 | 13 | 1 | Stefan Nystrand | |||
| 33 | 10 | 7 | Nabil Kebbab | |||
| 34 | 10 | 4 | Flori Lang | |||
| 35 | 11 | 6 | Nimrod Shapira Bar-Or | |||
| 36 | 10 | 2 | Ben Hockin | |||
| 37 | 11 | 7 | Velimir Stjepanovic | |||
| 38 | 10 | 3 | Mario Todorović | |||
| 38 | 11 | 5 | Jiang Haiqi | |||
| 40 | 10 | 1 | Crox Ernesto Acuna | |||
| 41 | 9 | 2 | Gabriel Melconian | |||
| 41 | 9 | 5 | Virdhaval Vikram Khade | |||
| 41 | 9 | 7 | Ryan Pini | |||
| 44 | 8 | 1 | Uvis Kalnins | |||
| 45 | 9 | 3 | Alexandre Agostinho | |||
| 46 | 7 | 4 | Branden Whitehurst | |||
| 47 | 7 | 5 | Roy-Allan Burch | NR | ||
| 48 | 8 | 7 | Sidni Hoxha | |||
| 49 | 8 | 4 | Ensar Hajder | |||
| 50 | 9 | 6 | Matias Aguilera | |||
| 51 | 8 | 5 | Charles William Walker | |||
| 52 | 8 | 8 | Ivars Akmentins | |||
| 53 | 8 | 6 | Shebab Younis | |||
| 54 | 7 | 8 | Amine Kouame | NR | ||
| 55 | 9 | 1 | Hoàng Quý Phước | |||
| 56 | 8 | 2 | Mohammad Bidarian | |||
| 57 | 6 | 5 | Luke Hall | |||
| 58 | 7 | 7 | Jemal le Grand | |||
| 59 | 6 | 7 | Quinton Delie | |||
| 60 | 6 | 4 | Jose Montoya | |||
| 61 | 7 | 2 | Kevin Avila | |||
| 62 | 8 | 3 | Mohamed Madouh | |||
| 63 | 9 | 8 | Phạm Thành Nguyện | |||
| 64 | 7 | 6 | Mikael Koloyan | |||
| 65 | 6 | 6 | Gerard Baldrich Pujol | NR | ||
| 66 | 7 | 1 | Christopher Duenas | |||
| 67 | 6 | 8 | Andrew Rutherfurd | |||
| 68 | 5 | 8 | Esau Simpson | |||
| 69 | 6 | 3 | Kareem Ennab | |||
| 70 | 6 | 2 | Nicholas Coard | |||
| 71 | 6 | 1 | Mahfizur Rahman Sagor | |||
| 72 | 5 | 4 | Anthony Clark | |||
| 73 | 5 | 2 | Abbas Raad | |||
| 74 | 5 | 1 | Niall Roberts | |||
| 74 | 5 | 3 | Chakyl Camal | |||
| 74 | 5 | 7 | Julien Brice | |||
| 77 | 4 | 3 | Sergey Krovyakov | |||
| 78 | 4 | 2 | Douglas Miller | |||
| 79 | 5 | 6 | Sofyan El Gadi | |||
| 80 | 4 | 4 | Omar Nunez | |||
| 81 | 4 | 1 | Christian Nikles | |||
| 82 | 5 | 5 | Tamir Andrei | |||
| 83 | 4 | 7 | Israr Hussain | |||
| 84 | 4 | 5 | Shane Mangroo | |||
| 85 | 4 | 8 | Mamadou Soumare | |||
| 86 | 4 | 6 | Tepaia Payne | |||
| 87 | 3 | 5 | Atta Tano Claver | |||
| 88 | 3 | 1 | Husam Ahmed | |||
| 89 | 3 | 2 | Inayath Hassan | |||
| 90 | 2 | 6 | Farhan Farhan | |||
| 91 | 3 | 6 | Zangan Gunsennorou | |||
| 92 | 2 | 4 | Prasiddha Jung Shah | |||
| 93 | 3 | 7 | Shailesh Shumsher Rana | |||
| 94 | 3 | 4 | Dionisio Augustine II | |||
| 95 | 2 | 2 | Shawn Wallace | |||
| 95 | 2 | 1 | Giordan Harris | |||
| 97 | 2 | 3 | Fdingue Ekane | |||
| 98 | 2 | 5 | Beni-Bertrand Binobagira | |||
| 99 | 3 | 8 | Ammaar Ghadiyali | |||
| 100 | 3 | 3 | Athoumani Youssouf | |||
| 101 | 1 | 4 | Amadou Camara | |||
| 102 | 2 | 7 | Kyle Zreibe | |||
| 103 | 1 | 6 | Daniel Langinbelik | |||
| 104 | 1 | 3 | Godonou Wilfrid Tevoedjre | |||
| 105 | 2 | 8 | Janvier Niyonkuru | |||
| – | 1 | 5 | Ahmed Chawali | DSQ | ||
| – | 7 | 3 | Brad Hamilton | DNS | ||
| – | 13 | 8 | Markus Deibler | DNS |
Semifinals
The semifinals were held at 18:02.Semifinal 1
| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | James Magnussen | 47.90 | Q | |
| 2 | 6 | Nathan Adrian | 48.05 | Q | |
| 3 | 5 | César Cielo | 48.34 | Q | |
| 4 | 8 | James Roberts | 48.49 | ||
| 5 | 3 | Andrey Grechin | 48.67 | ||
| 6 | 1 | Park Tae-Hwan | 48.86 | ||
| 7 | 2 | Gideon Louw | 48.96 | ||
| 8 | 7 | Nikita Lobintsev | 49.00 |
Semifinal 2
| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | William Meynard | 48.25 | Q | |
| 2 | 7 | Brent Hayden | 48.30 | Q | |
| 3 | 6 | Sebastiaan Verschuren | 48.41 | Q | |
| 4 | 1 | Luca Dotto | 48.44 | Q | |
| 5 | 3 | Fabien Gilot | 48.46 | Q | |
| 6 | 8 | Konrad Czerniak | 48.48 | ||
| 7 | 5 | Filippo Magnini | 48.50 | ||
| 8 | 2 | Graeme Moore | 48.59 |
Final
The final was held at 18.35.| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | James Magnussen | 47.63 | |||
| 6 | Brent Hayden | 47.95 | |||
| 3 | William Meynard | 48.00 | |||
| 4 | 2 | César Cielo | 48.01 | ||
| 5 | 8 | Fabien Gilot | 48.13 | ||
| 6 | 5 | Nathan Adrian | 48.23 | ||
| 7 | 1 | Luca Dotto | 48.24 | ||
| 8 | 7 | Sebastiaan Verschuren | 48.27 |