2018 Pan Pacific Swimming Championships – Women's 4 × 200 metre freestyle relay
# 2018 Pan Pacific Swimming Championships – Women's 4 × 200 metre freestyle relay

The women's 4 × 200 metre freestyle relay competition at the 2018 Pan Pacific Swimming Championships took place on August 10 at the Tokyo Tatsumi International Swimming Center. The defending champion was the United States.

## Records

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

| World record | China (CHN) Yang Yu (1:55.47) Zhu Qianwei (1:55.79) Liu Jing (1:56.09) Pang Jiaying (1:54.73) | 7:42.08 | Rome, Italy | 30 July 2009 |
| - | - | - | - | - |
| Pan Pacific Championships record | United States (USA) Shannon Vreeland (1:57.89) Missy Franklin (1:56.12) Leah Smith (1:58.03) Katie Ledecky (1:54.36) | 7:46.40 | Gold Coast, Australia | 22 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 10 August from 18:00.

| Rank | Lane | Nation | Swimmers | Time | Notes |
| - | - | - | - | - | - |
| | 5 | Australia | Ariarne Titmus (1:55.27) Emma McKeon (1:55.66) Mikkayla Sheridan (1:56.72) Madeline Groves (1:56.47) | 7:44.12 | CR, OC |
| | 4 | United States | Allison Schmitt (1:58.62) Leah Smith (1:56.44) Katie McLaughlin (1:55.47) Katie Ledecky (1:53.84) | 7:44.37 | |
| | 6 | Canada | Kayla Sanchez (1:58.37) Taylor Ruck (1:54.08) Rebecca Smith (1:58.08) Mackenzie Padington (1:56.75) | 7:47.28 | |
| 4 | 3 | Japan | Chihiro Igarashi (1:57.88) Rikako Ikee (1:54.69) Rio Shirai (1:58.29) Yui Ohashi (1:58.10) | 7:48.96 | NR |
