2018 Pan Pacific Swimming Championships – Women's 4 × 100 metre freestyle relay
# 2018 Pan Pacific Swimming Championships – Women's 4 × 100 metre freestyle relay

The women's 4 × 100 metre freestyle relay competition at the 2018 Pan Pacific Swimming Championships took place on August 11 at the Tokyo Tatsumi International Swimming Center. The defending champion was Australia.

## Records

Prior to this competition, the existing world and Pan Pacific records were as follows:

| World record | Australia (AUS) Shayna Jack (54.03) Bronte Campbell (52.03) Emma McKeon (52.99) Cate Campbell (51.00) | 3:30.05 | Gold Coast, Australia | 5 April 2018 |
| - | - | - | - | - |
| Pan Pacific Championships record | Australia (AUS) Cate Campbell (52.89) Brittany Elmslie (53.72) Melanie Schlanger (52.97) Bronte Campbell (52.88) | 3:32.46 | Gold Coast, Australia | 23 August 2014 |

## Results

All times are in minutes and seconds.

| KEY: | CR | Championships record | NR | National record | PB | Personal best | SB | Seasonal best |
| - | - | - | - | - | - | - | - | - |

### Final

The final was held on 11 August from 18:00.

| Rank | Lane | Nation | Swimmers | Time | Notes |
| - | - | - | - | - | - |
| | 4 | Australia | Emily Seebohm (54.56) Shayna Jack (53.10) Emma McKeon (52.56) Cate Campbell (51.36) | 3:31.58 | CR |
| | 5 | United States | Mallory Comerford (53.48) Margo Geer (53.59) Kelsi Dahlia (53.59) Simone Manuel (52.79) | 3:33.45 | |
| | 3 | Canada | Taylor Ruck (52.85) Kayla Sanchez (53.11) Rebecca Smith (54.00) Alexia Zevnik (54.11) | 3:34.07 | |
| 4 | 6 | Japan | Rikako Ikee (53.46) Mayuka Yamamoto (54.51) Tomomi Aoki (54.01) Chihiro Igarashi (54.95) | 3:36.93 | |
| 5 | 2 | Philippines | Rosalee Santa Ana (59.58) Miranda Renner (59.30) Chloe Isleta (58.47) Nicole Oliva (57.45) | 3:54.80 | |
