First 2 in each heat (Q) and the next 2 fastest (q)

POS Rank Heat BIB ATHLETE COUNTRY RESULTS ms*
1 1 3 1984 Sydney McLaughlin USAUSA 53.81 Q
2 1 1 1989 Dalilah Muhammad USAUSA 53.91 Q
3 1 2 1178 Rushell Clayton JAMJAM 54.17 Q
4 2 1 421 Sage Watson CANCAN 54.32 Q NR
5 2 2 594 Zuzana Hejnov√° CZECZE 54.41 Q
6 3 2 2006 Ashley Spencer USAUSA 54.42 q
7 3 1 1841 Anna Ryzhykova UKRUKR 54.45 q SB
8 2 3 1689 Lea Sprunger SUISUI 54.52 Q SB
9 4 1 571 Zurian Hechavarría CUBCUB 55.03 .023
10 4 2 1494 Amalie Iuel NORNOR 55.03 .027
11 3 3 1188 Shiann Salmon JAMJAM 55.16 PB
12 5 1 255 Hanne Claes BELBEL 55.25 SB
13 5 2 1125 Ayomide Folorunso ITAITA 55.36
14 6 2 1555 Joanna Linkiewicz POLPOL 55.38 SB
15 4 3 1141 Yadisleidis Pedroso ITAITA 55.40 SB
16 7 2 193 Sarah Carli AUSAUS 55.43 PB
17 5 3 373 Aminat Jamal BRNBRN 55.54
18 6 1 131 Vera Rudakova ANAANA 55.57
19 6 3 1514 Gianna Woodruff PANPAN 55.61 SB
20 7 3 866 Jessica Turner GBRGBR 55.87
21 8 3 178 Lauren Boden AUSAUS 55.94
22 7 1 1433 Femke Bol NEDNED 56.37
23 8 2 954 Carolina Krafzik GERGER 56.41
24 8 1 856 Meghan Beesley GBRGBR 56.89
Legend

ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second