# Ireland at the 2023 World Aquatics Championships

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

## Diving

Ireland entered 3 divers.

### Men

| Athlete | Event | Preliminaries | Preliminaries | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Jake Passmore | 1 m springboard | 344.60 | 17 | — | — | Did not advance | Did not advance |
| Jake Passmore | 3 m springboard | 319.65 | 45 | Did not advance | Did not advance | Did not advance | Did not advance |

### Women

| Athlete | Event | Preliminaries | Preliminaries | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Clare Cryan | 1 m springboard | 229.50 | 17 | — | — | Did not advance | Did not advance |
| Clare Cryan | 3 m springboard | 289.55 | 9 Q | 283.45 | 17 | Did not advance | Did not advance |
| Ciara McGing | 10 m platform | 244.90 | 28 | Did not advance | Did not advance | Did not advance | Did not advance |

### Mixed

| Athlete | Event | Final | Final |
| Athlete | Event | Points | Rank |
| Clare Cryan Jake Passmore | 3 m synchronized springboard | 237.18 | 15 |

## Swimming

Ireland entered 12 swimmers.

### Men

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Tom Fannon | 50 metre freestyle | 22.13 | 20 | Did not advance | Did not advance | Did not advance | Did not advance |
| Conor Ferguson | 50 metre backstroke | 24.95 | 11 | 25.09 | 13 | Did not advance | Did not advance |
| Conor Ferguson | 100 metre backstroke | 54.36 | 22 | Did not advance | Did not advance | Did not advance | Did not advance |
| Darragh Greene | 50 metre breaststroke | 27.54 | 22 | Did not advance | Did not advance | Did not advance | Did not advance |
| Darragh Greene | 100 metre breaststroke | 1:00.54 | 19 | Did not advance | Did not advance | Did not advance | Did not advance |
| Darragh Greene | 200 metre breaststroke | 2:12.21 | 18 | Did not advance | Did not advance | Did not advance | Did not advance |
| Max McCusker | 100 metre butterfly | 53.46 | 40 | Did not advance | Did not advance | Did not advance | Did not advance |
| Shane Ryan | 100 metre freestyle | 49.04 | 33 | Did not advance | Did not advance | Did not advance | Did not advance |
| John Shortt | 200 metre backstroke | 1:59.79 | 22 | Did not advance | Did not advance | Did not advance | Did not advance |
| Daniel Wiffen | 800 metre freestyle | 7:43.81 NR | 4 Q | — | — | 7:39.19 ER | 4 |
| Daniel Wiffen | 1500 metre freestyle | 14:43.50 | 2 Q | — | — | 14:43.01 | 4 |
| Conor Ferguson Darragh Greene Max McCusker Shane Ryan | 4 × 100 m medley relay | 3:35.03 | 13 | — | — | Did not advance | Did not advance |

### Women

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Victoria Catterson | 100 metre freestyle | 55.56 | 26 | Did not advance | Did not advance | Did not advance | Did not advance |
| Victoria Catterson | 200 metre freestyle | 2:00.82 | 31 | Did not advance | Did not advance | Did not advance | Did not advance |
| Danielle Hill | 50 metre freestyle | 25.55 | 30 | Did not advance | Did not advance | Did not advance | Did not advance |
| Danielle Hill | 50 metre backstroke | 28.03 | 13 Q | 28.10 | 10 | Did not advance | Did not advance |
| Danielle Hill | 100 metre backstroke | 1:01.51 | 27 | Did not advance | Did not advance | Did not advance | Did not advance |
| Danielle Hill | 50 metre butterfly | 26.90 | 30 | Did not advance | Did not advance | Did not advance | Did not advance |
| Mona McSharry | 50 metre breaststroke | 30.45 | 12 Q | 30.54 | 11 | Did not advance | Did not advance |
| Mona McSharry | 100 metre breaststroke | 1:05.55 NR | 2 Q | 1:05.96 | 4 Q | 1:06.07 | 5 |
| Mona McSharry | 200 metre breaststroke | 2:26.59 | 16 Q | 2:26.27 | 15 | Did not advance | Did not advance |
| Ellen Walshe | 100 metre butterfly | 59.39 | 24 | Did not advance | Did not advance | Did not advance | Did not advance |
| Ellen Walshe | 200 metre individual medley | 2:12.83 | 16 Q | 2:10.92 | 9 | Did not advance | Did not advance |
| Ellen Walshe | 400 metre individual medley | 4:43.24 | 16 | — | — | Did not advance | Did not advance |
| Mona McSharry Danielle Hill Erin Riordan Victoria Catterson | 4 × 100 m freestyle relay | 3:41.75 NR | 15 | — | — | Did not advance | Did not advance |
| Danielle Hill Mona McSharry Ellen Walshe Victoria Catterson | 4 × 100 m medley relay | 4:01.25 NR | 13 | — | — | Did not advance | Did not advance |