The girls' 4 × 100 metre medley relay event at the 2018 Summer Youth Olympics took place on 8 October at the Natatorium in Buenos Aires, Argentina.

Results Final The final was held at 19:29.Final results Rank Lane Name Nationality Time Notes 4 Peng Xuwei (1:01.64)Zheng Muyan (1:10.13)Lin Xintong (59.42)Yang Junxuan (53.99) 4:05.18 5 Kaylee McKeown (1:01.61)Chelsea Hodges (1:08.83)Michaela Ryan (1:00.12)Abbey Webb (54.90) 4:05.46 7 Daria Vaskina (1:02.74)Anastasia Makarova (1:08.63)Polina Egorova (59.50)Elizaveta Klevanovich (55.20) 4:06.07 4 1 Fernanda de Goeij (1:02.26)Ana Vieira (1:12.04)Maria Pessanha (1:00.63)Rafaela Raurich (56.00) 4:10.93 5 3 Rhyan White (1:01.66)Kate Douglass (1:10.85)Kaitlynn Sims (1:05.68)Maddie Donohoe (58.60) 4:16.79 6 6 Mariella Venter (1:04.12)Christin Mundell (1:12.05)Duné Coetzee (1:02.61)Kate Beavon (59.00) 4:17.78 2 Madison Broad (1:02.26)Nina Kucheran (1:10.46)Avery Wiseman (1:04.03)Kyla Leibel

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