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 recordShayna Jack (54.03)Bronte Campbell (52.03)Emma McKeon (52.99)Cate Campbell (51.00)3:30.05Gold Coast, Australia5 April 2018Pan Pacific Championships recordCate Campbell (52.89)Brittany Elmslie (53.72)Melanie Schlanger (52.97)Bronte Campbell (52.88)3:32.46Gold Coast, Australia23 August 2014

Results All times are in minutes and seconds.

KEY:CRChampionships recordNRNational recordPBPersonal bestSBSeasonal best

Final The final was held on 11 August from 18:00. Rank Lane Nation Swimmers Time Notes 4 Emily Seebohm (54.56)Shayna Jack (53.10)Emma McKeon (52.56)Cate Campbell (51.36)3:31.58CR 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

References