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 recordYang Yu (1:55.47)Zhu Qianwei (1:55.79)Liu Jing (1:56.09)Pang Jiaying (1:54.73)7:42.08Rome, Italy30 July 2009Pan Pacific Championships recordShannon Vreeland (1:57.89)Missy Franklin (1:56.12)Leah Smith (1:58.03)Katie Ledecky (1:54.36)7:46.40Gold Coast, Australia22 August 2014

Results All times are in minutes and seconds.

KEY:CRChampionships recordNRNational recordPBPersonal bestSBSeasonal best

Final The final was held on 10 August from 18:00. Rank Lane Nation Swimmers Time Notes 5 Ariarne Titmus (1:55.27)Emma McKeon (1:55.66)Mikkayla Sheridan (1:56.72)Madeline Groves (1:56.47)7:44.12CR, OC 4 Allison Schmitt (1:58.62)Leah Smith (1:56.44)Katie McLaughlin (1:55.47)Katie Ledecky (1:53.84)7:44.37 6 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 Chihiro Igarashi (1:57.88)Rikako Ikee (1:54.69)Rio Shirai (1:58.29)Yui Ohashi (1:58.10)7:48.96NR

References