The women's 4 × 100 metre medley relay competition at the 2002 Pan Pacific Swimming Championships took place on August 29 at the Yokohama International Swimming Pool.

[1][2] Australia won gold with the previous champion being the United States.

[3] Prior to this competition, the existing world and Pan Pacific records were as follows: All times are in minutes and seconds.

Heats weren't performed, as only six teams had entered.

The final was held on August 29.