# Swimming at the 2023 World Aquatics Championships – Men's 100 metre backstroke

The men's 100 metre backstroke competition at the 2023 World Aquatics Championships was held on 24 and 25 July 2023.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Thomas Ceccon (ITA) | 51.60 | Budapest, Hungary | 20 June 2022 |
| Competition record | Thomas Ceccon (ITA) | 51.60 | Budapest, Hungary | 20 June 2022 |

## Results
### Heats

The heats were started on 24 July at 10:51.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 5 | Xu Jiayu | China | 52.87 | Q |
| 2 | 7 | 1 | Hubert Kós | Hungary | 53.12 | Q, NR |
| 3 | 7 | 3 | Ksawery Masiuk | Poland | 53.15 | Q |
| 4 | 6 | 4 | Ryan Murphy | United States | 53.43 | Q |
| 5 | 6 | 7 | Oliver Morgan | Great Britain | 53.52 | Q |
| 6 | 5 | 3 | Mewen Tomac | France | 53.57 | Q |
| 6 | 6 | 6 | Ole Braunschweig | Germany | 53.57 | Q |
| 6 | 7 | 2 | Roman Mityukov | Switzerland | 53.57 | Q |
| 9 | 5 | 6 | Hugo González | Spain | 53.70 | Q |
| 10 | 5 | 1 | João Costa | Portugal | 53.71 | Q, NR |
| 11 | 6 | 1 | Bradley Woodward | Australia | 53.72 | Q |
| 12 | 7 | 7 | Kacper Stokowski | Poland | 53.81 | Q |
| 13 | 6 | 2 | Andrew Jeffcoat | New Zealand | 53.82 | Q |
| 14 | 7 | 4 | Thomas Ceccon | Italy | 53.84 | Q |
| 15 | 5 | 5 | Yohann Ndoye-Brouard | France | 53.90 | Q |
| 16 | 5 | 4 | Hunter Armstrong | United States | 53.94 | Q |
| 17 | 7 | 6 | Isaac Cooper | Australia | 53.95 | |
| 18 | 6 | 3 | Ryosuke Irie | Japan | 53.98 | |
| 19 | 7 | 5 | Apostolos Christou | Greece | 54.01 | |
| 20 | 5 | 8 | Lee Ju-ho | South Korea | 54.21 | |
| 21 | 5 | 2 | Benedek Kovács | Hungary | 54.24 | |
| 22 | 6 | 8 | Conor Ferguson | Ireland | 54.36 | |
| 23 | 7 | 0 | Guilherme Basseto | Brazil | 54.45 | |
| 24 | 6 | 0 | Tomáš Franta | Czech Republic | 54.50 | |
| 25 | 7 | 8 | Cameron Brooker | Great Britain | 54.54 | |
| 26 | 5 | 7 | Javier Acevedo | Canada | 54.58 | |
| 27 | 4 | 5 | Markus Lie | Norway | 54.66 | |
| 28 | 4 | 7 | Chuang Mu-lun | Chinese Taipei | 54.95 | NR |
| 29 | 4 | 3 | Berke Saka | Turkey | 55.09 | |
| 30 | 5 | 9 | Erikas Grigaitis | Lithuania | 55.23 | |
| 31 | 7 | 9 | Srihari Nataraj | India | 55.26 | |
| 32 | 4 | 4 | Quah Zheng Wen | Singapore | 55.30 | |
| 33 | 5 | 0 | Michael Laitarovsky | Israel | 55.63 | |
| 34 | 4 | 6 | Andrei-Mircea Anghel | Romania | 55.77 | |
| 35 | 4 | 1 | Diego Camacho | Mexico | 55.80 | |
| 36 | 4 | 2 | Ģirts Feldbergs | Latvia | 55.91 | |
| 37 | 4 | 8 | Ziyad Ahmed | Sudan | 56.02 | |
| 38 | 3 | 3 | Jack Kirby | Barbados | 56.08 | |
| 39 | 3 | 5 | Charles Hockin | Paraguay | 56.56 | |
| 40 | 3 | 8 | Maximillian Wilson | U.S. Virgin Islands | 56.65 | |
| 41 | 2 | 5 | Merdan Ataýew | Turkmenistan | 56.96 | |
| 42 | 3 | 9 | Jack Harvey | Bermuda | 57.04 | NR |
| 43 | 4 | 9 | Armin Evert Lelle | Estonia | 57.06 | |
| 44 | 3 | 6 | Noe Pantskhava | Georgia | 57.10 | |
| 45 | 2 | 3 | Yazan Al-Bawwab | Palestine | 57.16 | |
| 46 | 2 | 6 | Denilson Cyprianos | Zimbabwe | 57.29 | NR |
| 47 | 3 | 0 | Davante Carey | Bahamas | 57.50 | |
| 48 | 3 | 7 | Filippos Iakovidis | Cyprus | 57.51 | |
| 49 | 4 | 0 | Farrel Tangkas | Indonesia | 58.06 | |
| 50 | 3 | 2 | Lau Shiu Yue | Hong Kong | 58.21 | |
| 51 | 3 | 4 | Jerard Jacinto | Suspended Member Federation | 58.40 | |
| 52 | 3 | 1 | Homer Abbasi | Iran | 58.45 | |
| 53 | 2 | 4 | Zhulian Lavdaniti | Albania | 58.48 | |
| 54 | 2 | 2 | Matthieu Seye | Senegal | 58.59 | |
| 55 | 1 | 4 | Mohamad Zubaid | Kuwait | 59.56 | |
| 56 | 2 | 0 | Zeke Chan | Brunei | 59.61 | |
| 57 | 2 | 8 | Zackary Gresham | Grenada | 59.68 | |
| 58 | 2 | 1 | Bede Aitu | Cook Islands | 1:01.15 | |
| 59 | 1 | 3 | Omer Huraish | Iraq | 1:03.15 | |
| 60 | 1 | 5 | Ali Imaan | Maldives | 1:04.98 | |
| 61 | 2 | 9 | Adnan Kabuye | Uganda | 1:05.57 | |
| | 2 | 7 | Erkhes Enkhtur | Mongolia | DSQ | DSQ |
| | 6 | 9 | Bernhard Reitshammer | Austria | DNS | DNS |

### Semifinals

The semifinals were started on 24 July at 20:17.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | 1 | Thomas Ceccon | Italy | 52.16 | Q |
| 2 | 2 | 4 | Xu Jiayu | China | 52.42 | Q |
| 3 | 1 | 5 | Ryan Murphy | United States | 52.56 | Q |
| 4 | 1 | 3 | Mewen Tomac | France | 52.86 | Q |
| 5 | 2 | 8 | Yohann Ndoye-Brouard | France | 53.06 | Q |
| 6 | 1 | 4 | Hubert Kós | Hungary | 53.17 | Q |
| 7 | 2 | 5 | Ksawery Masiuk | Poland | 53.20 | Q |
| 8 | 1 | 8 | Hunter Armstrong | United States | 53.21 | Q |
| 9 | 2 | 3 | Oliver Morgan | Great Britain | 53.26 | |
| 10 | 1 | 6 | Roman Mityukov | Switzerland | 53.32 | NR |
| 11 | 2 | 2 | Hugo González | Spain | 53.38 | |
| 12 | 2 | 1 | Andrew Jeffcoat | New Zealand | 53.46 | |
| 13 | 2 | 7 | Bradley Woodward | Australia | 53.73 | |
| 14 | 1 | 7 | Kacper Stokowski | Poland | 53.96 | |
| 15 | 2 | 6 | Ole Braunschweig | Germany | 54.00 | |
| 16 | 1 | 2 | João Costa | Portugal | 54.30 | |

### Final

The final was held on 25 July at 20:59.
| Rank | Lane | Name | Nationality | Time |
| | 3 | Ryan Murphy | United States | 52.22 |
| | 4 | Thomas Ceccon | Italy | 52.27 |
| | 8 | Hunter Armstrong | United States | 52.58 |
| 4 | 5 | Xu Jiayu | China | 52.64 |
| 5 | 2 | Yohann Ndoye-Brouard | France | 52.84 |
| 6 | 1 | Ksawery Masiuk | Poland | 52.92 |
| 7 | 7 | Hubert Kós | Hungary | 53.11 |
| 8 | 6 | Mewen Tomac | France | 53.16 |