# Swimming at the 2024 World Aquatics Championships – Men's 100 metre backstroke

The Men's 100 metre backstroke competition at the 2024 World Aquatics Championships was held on 12 and 13 February 2024.

## 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 12 February at 09:48.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | 4 | Pieter Coetze | South Africa | 53.32 | Q |
| 2 | 6 | 1 | Evangelos Makrygiannis | Greece | 53.43 | Q |
| 3 | 4 | 3 | Hugo González | Spain | 53.61 | Q |
| 4 | 6 | 4 | Hunter Armstrong | United States | 53.66 | Q |
| 5 | 6 | 7 | Michele Lamberti | Italy | 53.73 | Q |
| 6 | 5 | 3 | Bradley Woodward | Australia | 53.76 | Q |
| 7 | 6 | 5 | Apostolos Christou | Greece | 53.79 | Q |
| 8 | 6 | 2 | Lee Ju-ho | South Korea | 53.81 | Q |
| 9 | 5 | 1 | Kai van Westering | Netherlands | 53.84 | Q |
| 10 | 6 | 6 | Jack Aikins | United States | 53.87 | Q |
| 11 | 4 | 7 | Conor Ferguson | Ireland | 53.95 | Q |
| 12 | 4 | 5 | Roman Mityukov | Switzerland | 54.10 | Q |
| 12 | 4 | 6 | Ole Braunschweig | Germany | 54.10 | Q |
| 14 | 5 | 5 | Miroslav Knedla | Czech Republic | 54.20 | Q |
| 15 | 4 | 2 | Kacper Stokowski | Poland | 54.23 | Q |
| 16 | 5 | 2 | Oleksandr Zheltiakov | Ukraine | 54.24 | Q |
| 17 | 4 | 4 | Ksawery Masiuk | Poland | 54.33 | |
| 18 | 4 | 1 | Blake Tierney | Canada | 54.46 | |
| 19 | 6 | 3 | Ádám Jászo | Hungary | 54.51 | |
| 20 | 5 | 7 | Ulises Saravia | Argentina | 54.60 | |
| 21 | 5 | 6 | Andrew Jeffcoat | New Zealand | 54.63 | |
| 22 | 6 | 8 | Osamu Kato | Japan | 54.70 | |
| 23 | 4 | 8 | Luke Greenbank | Great Britain | 54.93 | |
| 24 | 4 | 0 | Gabriel Lopes | Portugal | 55.08 | |
| 25 | 5 | 8 | Denis-Laurean Popescu | Romania | 55.33 | |
| 26 | 3 | 3 | Kaloyan Levterov | Bulgaria | 55.44 | |
| 26 | 3 | 6 | Ziyad Saleem | Sudan | 55.44 | |
| 26 | 6 | 0 | Bernhard Reitshammer | Austria | 55.44 | |
| 29 | 5 | 0 | Erikas Grigaitis | Lithuania | 55.48 | |
| 30 | 6 | 9 | Yeziel Morales | Puerto Rico | 55.50 | |
| 31 | 4 | 9 | Girts Feldbergs | Latvia | 56.02 | |
| 32 | 1 | 4 | Remi Fabiani | Luxembourg | 56.21 | |
| 33 | 3 | 5 | Yegor Popov | Kazakhstan | 56.59 | |
| 34 | 3 | 8 | Denilson Cyprianos | Zimbabwe | 56.82 | |
| 35 | 3 | 4 | Jerard Jacinto | Philippines | 57.18 | |
| 36 | 3 | 2 | Charles Hockin | Paraguay | 57.20 | |
| 37 | 3 | 7 | Merdan Atayev | Turkmenistan | 57.21 | |
| 37 | 5 | 9 | Farrel Tangkas | Indonesia | 57.21 | |
| 39 | 2 | 5 | Anthony Piñeiro | Dominican Republic | 57.41 | |
| 40 | 2 | 9 | Akalanka Peiris | Sri Lanka | 57.52 | |
| 41 | 3 | 0 | Lau Shiu Yue | Hong Kong | 57.76 | |
| 42 | 2 | 3 | Alexis Kpade | Benin | 58.03 | |
| 43 | 2 | 4 | Ahmad Safie | Lebanon | 58.32 | |
| 44 | 2 | 6 | Dino Sirotanović | Bosnia and Herzegovina | 58.81 | |
| 45 | 3 | 9 | Guido Montero | Costa Rica | 58.88 | |
| 46 | 2 | 2 | Erkhes Enkhtur | Mongolia | 58.89 | |
| 47 | 1 | 5 | Samiul Rafi | Bangladesh | 58.95 | NR |
| 48 | 3 | 1 | Yazan Al-Bawwab | Palestine | 59.31 | |
| 49 | 2 | 8 | Zackary Gresham | Grenada | 59.81 | |
| 50 | 2 | 1 | Zeke Chan | Brunei | 1:00.49 | |
| 51 | 2 | 0 | Alan Uhi | Tonga | 1:01.47 | |
| 52 | 1 | 3 | Israel Poppe | Guam | 1:02.83 | |
| 53 | 2 | 7 | Oscar Peyre | Rwanda | 1:03.56 | |

### Semifinals

The semifinals were held on 12 February at 19:17.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | 5 | Hunter Armstrong | United States | 53.04 | Q |
| 2 | 2 | 4 | Pieter Coetze | South Africa | 53.07 | Q |
| 3 | 2 | 5 | Hugo González | Spain | 53.22 | Q |
| 4 | 2 | 6 | Apostolos Christou | Greece | 53.62 | Q |
| 5 | 1 | 7 | Roman Mityukov | Switzerland | 53.64 | Q |
| 6 | 1 | 4 | Evangelos Makrygiannis | Greece | 53.67 | Q |
| 7 | 1 | 1 | Miroslav Knedla | Czech Republic | 53.70 | Q |
| 8 | 1 | 2 | Jack Aikins | United States | 53.72 | Q |
| 9 | 2 | 2 | Kai van Westering | Netherlands | 53.80 | |
| 10 | 1 | 6 | Lee Ju-ho | South Korea | 53.82 | |
| 11 | 2 | 1 | Ole Braunschweig | Germany | 53.89 | |
| 11 | 2 | 3 | Michele Lamberti | Italy | 53.89 | |
| 13 | 2 | 7 | Conor Ferguson | Ireland | 53.90 | |
| 14 | 2 | 8 | Kacper Stokowski | Poland | 54.03 | |
| 15 | 1 | 8 | Oleksandr Zheltiakov | Ukraine | 54.05 | |
| 16 | 1 | 3 | Bradley Woodward | Australia | 54.20 | |

### Final

The final was held on 13 February at 19:59.
| Rank | Lane | Name | Nationality | Time |
| | 4 | Hunter Armstrong | United States | 52.68 |
| | 3 | Hugo González | Spain | 52.70 |
| | 6 | Apostolos Christou | Greece | 53.36 |
| 4 | 7 | Evangelos Makrygiannis | Greece | 53.38 |
| 5 | 5 | Pieter Coetze | South Africa | 53.51 |
| 6 | 2 | Roman Mityukov | Switzerland | 53.64 |
| 7 | 1 | Miroslav Knedla | Czech Republic | 53.74 |
| 8 | 8 | Jack Aikins | United States | 54.50 |