Swimming at the 2011 World Aquatics Championships – Men's 50 metre backstroke
The men's 50 metre backstroke competition of the swimming events at the 2011 World Aquatics Championships was held on July 30 with the heats and the semifinals and July 31 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 | Liam Tancock | 24.04 | Rome | August 2, 2009 |
Results
Heats
39 swimmers participated in 6 heats.| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 5 | Gerhard Zandberg | 24.72 | Q | |
| 2 | 6 | 4 | Camille Lacourt | 25.03 | Q | |
| 3 | 6 | 2 | Helge Meeuw | 25.04 | Q | |
| 4 | 4 | 7 | Flori Lang | 25.12 | Q | |
| 5 | 4 | 2 | Aschwin Wildeboer | 25.14 | Q | |
| 6 | 6 | 5 | Junya Koga | 25.17 | Q | |
| 7 | 4 | 3 | Guy Barnea | 25.18 | Q | |
| 8 | 4 | 4 | Nick Thoman | 25.22 | Q | |
| 8 | 5 | 5 | David Plummer | 25.22 | Q | |
| 10 | 5 | 4 | Liam Tancock | 25.26 | Q | |
| 10 | 5 | 1 | Aristeidis Grigoriadis | 25.26 | Q | |
| 12 | 6 | 1 | Mirco di Tora | 25.28 | Q | |
| 13 | 5 | 6 | Hayden Stoeckel | 25.29 | Q | |
| 14 | 6 | 3 | Ashley Delaney | 25.33 | Q | |
| 14 | 6 | 6 | Bastiaan Lijesen | 25.33 | Q | |
| 16 | 5 | 8 | Charles Francis | 25.43 | Q | |
| 17 | 5 | 3 | Sun Xiaolei | 25.44 | ||
| 18 | 5 | 7 | Cheng Feiyi | 25.52 | ||
| 19 | 4 | 1 | Guilherme Guido | 25.58 | ||
| 20 | 5 | 2 | Vitaly Borisov | 25.60 | ||
| 21 | 4 | 8 | Pavel Sankovich | 25.80 | ||
| 22 | 6 | 7 | Daniel Bell | 25.91 | ||
| 23 | 3 | 3 | Roko Šimunić | 26.07 | ||
| 24 | 3 | 4 | Pedro Medel | 26.08 | ||
| 25 | 6 | 8 | Federico Grabich | 26.13 | ||
| 26 | 3 | 6 | Jean-François Schneiders | 26.70 | ||
| 27 | 3 | 7 | Oliver Elliot Banados | 26.72 | NR | |
| 28 | 3 | 1 | Zane Jordan | 27.12 | ||
| 29 | 3 | 2 | Boris Kirillov | 27.25 | ||
| 30 | 2 | 4 | Emile Bakale | 28.34 | ||
| 31 | 3 | 8 | Antonio Tong | 28.46 | ||
| 32 | 2 | 5 | Alban Laye-Joseph Diop | 29.02 | ||
| 33 | 1 | 3 | Kerson Hadley | 30.46 | ||
| 34 | 2 | 2 | Ahmed Atari | 32.37 | ||
| 35 | 2 | 7 | Husam Ahmed | 33.44 | ||
| 36 | 2 | 1 | Mulualem Girma | 33.85 | ||
| 37 | 1 | 4 | Phathana Inthavong | 35.30 | ||
| 38 | 2 | 8 | Mohamed Eltayeb | 35.98 | ||
| 39 | 1 | 5 | Thierry Videgni | 42.95 | ||
| – | 2 | 3 | Adbulrahman Alishaq | DNS | ||
| – | 2 | 6 | Folarin Ogunsola | DNS | ||
| – | 3 | 5 | Omar Pinzón | DNS | ||
| – | 4 | 6 | Ryosuke Irie | DNS |
Semifinals
The semifinals were held at 19:14.Semifinal 1
Semifinal 2
Final
The final was held at 18:35.| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Liam Tancock | 24.50 | |||
| 5 | Camille Lacourt | 24.57 | |||
| 3 | Gerhard Zandberg | 24.66 | |||
| 4 | 6 | Aschwin Wildeboer | 24.82 | ||
| 5 | 7 | David Plummer | 24.92 | ||
| 6 | 2 | Nick Thoman | 25.01 | ||
| 6 | 8 | Guy Barnea | 25.01 | ||
| 8 | 1 | Flori Lang | 25.15 |