# Czech Republic at the 2023 World Aquatics Championships

Czech Republic competed at the 2023 World Aquatics Championships in Fukuoka, Japan from 14 to 30 July.

## Artistic swimming

Czech Republic entered 2 artistic swimmers.

### Women

| Athlete | Event | Preliminaries | Preliminaries | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Karolína Klusková | Solo technical routine | 165.1000 | 21 | did not advance | did not advance |
| Karolína Klusková | Solo free routine | 115.0375 | 24 | did not advance | did not advance |
| Karolína Klusková Aneta Mrázková | Duet technical routine | 183.8601 | 22 | did not advance | did not advance |
| Karolína Klusková Aneta Mrázková | Duet free routine | 115.5354 | 32 | did not advance | did not advance |

## Open water swimming

Czech Republic entered 4 open water swimmers.

### Men

| Athlete | Event | Time | Rank |
| Martin Straka | Men's 5 km | 56:49.5 | 20 |
| Martin Straka | Men's 10 km | 1:53:16.2 | 13 |
| Ondřej Zach | Men's 5 km | 56:52.2 | 22 |
| Ondřej Zach | Men's 10 km | 1:57:36.7 | 37 |

### Women

| Athlete | Event | Time | Rank |
| Alena Benešová | Women's 5 km | 1:02:29.4 | 37 |
| Alena Benešová | Women's 10 km | 2:07:24.3 | 32 |
| Lenka Štěrbová | Women's 5 km | 1:01:46.7 | 26 |
| Lenka Štěrbová | Women's 10 km | 2:09:36.5 | 37 |

### Mixed

| Athlete | Event | Time | Rank |
| Alena Benešová Martin Straka Lenka Štěrbová Ondřej Zach | Team relay | 1:17:41.7 | 16 |

## Swimming

Czech Republic entered 5 swimmers, but Kristýna Horská has withdrawn because of injury.

### Men

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Tomáš Franta | 50 metre backstroke | 25.35 | 24 | Did not advance | Did not advance | Did not advance | Did not advance |
| Tomáš Franta | 100 metre backstroke | 54.50 | 24 | Did not advance | Did not advance | Did not advance | Did not advance |
| Daniel Gracík | 50 metre butterfly | 23.96 | 43 | Did not advance | Did not advance | Did not advance | Did not advance |
| Daniel Gracík | 100 metre butterfly | 53.13 | 37 | Did not advance | Did not advance | Did not advance | Did not advance |

### Women

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Kristýna Horská | 100 metre breaststroke | Did not start | Did not start | Did not start | Did not start | Did not start | Did not start |
| Kristýna Horská | 200 metre breaststroke | Did not start | Did not start | Did not start | Did not start | Did not start | Did not start |
| Kristýna Horská | 200 metre individual medley | Did not start | Did not start | Did not start | Did not start | Did not start | Did not start |
| Simona Kubová | 50 metre backstroke | 28.14 | 14 Q | 28.16 | 15 | Did not advance | Did not advance |
| Simona Kubová | 100 metre backstroke | 1:00.45 | 14 Q | 1:00.43 | 14 | Did not advance | Did not advance |
| Barbora Seemanová | 50 metre freestyle | 25.68 | 34 | Did not advance | Did not advance | Did not advance | Did not advance |
| Barbora Seemanová | 100 metre freestyle | 55.04 | 21 | Did not advance | Did not advance | Did not advance | Did not advance |
| Barbora Seemanová | 200 metre freestyle | 1:57.35 | 8 Q | 1:56.50 | 9 | Did not advance | Did not advance |
| Barbora Seemanová | 50 metre butterfly | 27.02 | 32 | Did not advance | Did not advance | Did not advance | Did not advance |
| Barbora Seemanová | 100 metre butterfly | 59.36 | 22 | Did not advance | Did not advance | Did not advance | Did not advance |