The Women's 800 metre freestyle competition of the 2016 FINA World Swimming Championships (25 m) was held on 7 and 8 December 2016.

Records Prior to the competition, the existing world and championship records were as follows. Name Nation Time Location DateWorld recordMireia Belmonte7:59.34Berlin10 August 2013Championship recordMireia Belmonte8:03.41Doha4 December 2014

Results Heats The heats were held at 11:31.

Rank Heat Lane Name Nationality Time Notes 1 4 4 Leah Smith 8:07.67 Q, AM 2 3 4 Ashley Twichell 8:16.08 Q 3 3 3 Kiah Melverton 8:23.51 Q 4 4 2 Olivia Anderson 8:24.65 Q 5 4 5 Katinka Hosszú 8:25.00 Q 6 2 4 Delfina Pignatiello 8:25.05 Q, NR 7 3 2 Zhang Yuhan 8:25.33 Q 8 4 8 Ariarne Titmus 8:25.85 Q 9 4 3 Sharon van Rouwendaal 8:27.41 10 4 7 Celine Rieder 8:28.50 11 4 6 Viviane Jungblut 8:29.58 12 3 1 Hannah Miley 8:30.96 13 3 8 Yuna Kikuchi 8:33.06 14 3 7 Gaja Natlacen 8:34.59 15 4 0 Martina Elhenická 8:34.60 16 3 6 Dong Jie 8:35.69 17 3 9 Diana Durães 8:36.08 18 4 1 Misato Iwanaga 8:38.61 19 4 9 Julia Hassler 8:39.95 20 3 0 Tamila Holub 8:41.46 21 2 6 Helena Moreno 8:44.01 NR 22 2 7 Souad Nefissa Cherouati 8:45.40 NR 23 2 5 Monique Olivier 8:45.47 24 2 3 Benjaporn Sriphanomthorn 8:54.90 NR 25 2 8 Nejla Karić 8:57.87 NR 26 2 1 Daniella van den Berg 8:58.72 NR 27 2 2 Daniela Miyahara Coello 8:59.57 28 1 4 Rosalee Mira Santa Ana 9:02.19 NR 29 1 5 Gabriella Doueihy 9:03.93 NR 30 2 9 Malavika Vishwanath 9:12.08 31 1 3 Fatima Alkaramova 9:25.50 NR 32 1 6 Osisang Chilton 10:15.29 NR 2 0 Talita Te Flan 3 5 Mireia Belmonte

Final The final was held at 20:06.

Rank Lane Name Nationality Time Notes 4 Leah Smith 8:10.17 5 Ashley Twichell 8:11.95 3 Kiah Melverton 8:16.51 4 8 Ariarne Titmus 8:17.95 5 1 Zhang Yuhan 8:21.05 6 7 Delfina Pignatiello 8:26.41 7 6 Olivia Anderson 8:30.16 8 2 Katinka Hosszú 8:36.76

References