The girls' 800 metre freestyle event at the 2018 Summer Youth Olympics took place on 9 October at the Natatorium in Buenos Aires, Argentina.

Results The heats were started at 10:00 and 18:00.Results Summary Rank Heat Lane Name Nationality Time Notes 3 5 Ajna Késely 8:27.60 3 4 Delfina Pignatiello 8:32.42 3 2 Marlene Kahler 8:36.57 3 8 Delfina Dini 8:43.71 3 3 Celine Rieder 8:43.73 2 3 Gan Ching Hwee 8:44.69 3 1 Kaitlynn Sims 8:46.40 2 6 María Román 8:48.88 3 6 Maddie Donohoe 8:48.96 10 3 7 Andrea Galisteo 8:49.85 11 2 5 Nicole Oliva 8:52.29 12 2 1 Malene Rypestøl 8:54.64 13 2 2 Samantha Bello 8:54.89 14 1 4 Erika Fairweather 8:56.14 15 1 5 Arianna Valloni 8:57.00 16 2 4 Kate Beavon 8:59.60 17 2 7 Tinky Ho 9:02.08 18 2 8 Alexandra Frazão 9:05.25 19 1 3 Sandy Atef 9:16.73 20 1 6 Vasiliki Kadoglu 9:18.92 21 1 2 Jennifer Ramírez 9:28.18

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