| Event: | Women's 4 × 100 metre freestyle relay |
| Competition: | 2018 Pan Pacific Swimming Championships |
| Venue: | Tokyo Tatsumi International Swimming Center |
| Dates: | 11 August |
| Competitors: | 20 |
| Nations: | 5 |
| Win Value: | 3:31.58 |
| Gold: | Emily Seebohm Shayna Jack Emma McKeon Cate Campbell |
| Goldnoc: | AUS |
| Silver: | Mallory Comerford Margo Geer Kelsi Dahlia Simone Manuel |
| Silvernoc: | USA |
| Bronze: | Taylor Ruck Kayla Sanchez Rebecca Smith Alexia Zevnik |
| Bronzenoc: | CAN |
| Prev: | 2014 |
| Next: | 2022 |
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.[1] The defending champion was Australia.[2]
Prior to this competition, the existing world and Pan Pacific records were as follows:
| World record | 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 | 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 |
All times are in minutes and seconds.
| KEY: | CR | Championships record | NR | National record | PB | Personal best | SB | Seasonal best |
The final was held on 11 August from 18:00.[3]
| Rank | Lane | Nation | Swimmers | Time | Notes | |
|---|---|---|---|---|---|---|
| 4 | Emily Seebohm (54.56) Shayna Jack (53.10) Emma McKeon (52.56) Cate Campbell (51.36) | 3:31.58 | CR | |||
| 5 | Mallory Comerford (53.48) Margo Geer (53.59) Kelsi Dahlia (53.59) Simone Manuel (52.79) | 3:33.45 | ||||
| 3 | Taylor Ruck (52.85) Kayla Sanchez (53.11) Rebecca Smith (54.00) Alexia Zevnik (54.11) | 3:34.07 | ||||
| 4 | 6 | Rikako Ikee (53.46) Mayuka Yamamoto (54.51) Tomomi Aoki (54.01) Chihiro Igarashi (54.95) | 3:36.93 | |||
| 5 | 2 | Rosalee Santa Ana (59.58) Miranda Renner (59.30) Chloe Isleta (58.47) Nicole Oliva (57.45) | 3:54.80 |