Swimming at the 2023 World Aquatics Championships – Men's 50 metre backstroke

Prior to the competition, the existing world and championship records were as follows.^[4]

World record	Hunter Armstrong (USA)	23.71	Greensboro, United States	28 April 2022
Competition record	Liam Tancock (GBR)	24.04	Rome, Italy	2 August 2009

Heats

The heats were started on 29 July at 10:55.^[5]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	6	4	Justin Ress	United States	24.18	Q
2	5	4	Apostolos Christou	Greece	24.48	Q
3	7	4	Hunter Armstrong	United States	24.49	Q
4	5	5	Ksawery Masiuk	Poland	24.71	Q
5	6	3	Ole Braunschweig	Germany	24.72	Q
6	7	3	Xu Jiayu	China	24.73	Q
6	7	5	Isaac Cooper	Australia	24.73	Q
8	6	5	Thomas Ceccon	Italy	24.80	Q
9	6	2	Andrei-Mircea Anghel	Romania	24.86	Q
10	5	7	Kacper Stokowski	Poland	24.91	Q
11	5	3	Andrew Jeffcoat	New Zealand	24.95	Q
11	6	7	Conor Ferguson	Ireland	24.95	Q
13	7	2	Takeshi Kawamoto	Japan	25.05	Q
14	4	5	Yassin Hossam	Egypt	25.07	Q
15	5	1	Michael Laitarovsky	Israel	25.10	Q
16	5	6	Ryosuke Irie	Japan	25.11	Q
17	6	9	Lamar Taylor	Bahamas	25.12
18	6	0	Adrian Santos	Spain	25.15
19	5	2	Javier Acevedo	Canada	25.18
19	7	8	Won Young-jun	South Korea	25.18
21	7	6	Guilherme Basseto	Brazil	25.22
22	5	9	João Costa	Portugal	25.28	NR
23	7	1	Wang Gukailai	China	25.29
24	7	7	Tomáš Franta	Czech Republic	25.35
25	6	6	Björn Seeliger	Sweden	25.38
26	6	8	Hugo González	Spain	25.42
27	4	3	Chuang Mu-lun	Chinese Taipei	25.50
28	7	9	Srihari Nataraj	India	25.51
29	4	8	Markus Lie	Norway	25.55
30	6	1	Áron Székely	Hungary	25.59
31	7	0	Roman Mityukov	Switzerland	25.61
32	4	4	Quah Zheng Wen	Singapore	25.76
33	3	2	Remi Fabiani	Luxembourg	25.87
33	5	0	I Gede Siman Sudartawa	Indonesia	25.87
35	4	7	Ģirts Feldbergs	Latvia	25.93
36	4	2	Charles Hockin	Paraguay	25.96
37	4	1	Clayton Jimmie	South Africa	25.97
38	3	5	Diego Camacho	Mexico	26.04
39	3	1	Jack Kirby	Barbados	26.17
40	3	6	Tonnam Kanteemool	Thailand	26.39
41	4	6	Jerard Jacinto	Suspended Member Federation	26.41
42	4	0	Filippos Iakovidis	Cyprus	26.42
43	3	8	Maximillian Wilson	U.S. Virgin Islands	26.62
44	4	9	Noe Pantskhava	Georgia	26.63
45	3	3	Homer Abbasi	Iran	26.70
45	3	7	Lau Shiu Yue	Hong Kong	26.70
47	1	4	Isaiah Aleksenko	Northern Mariana Islands	26.94
47	3	0	Enkhtur Erkhes	Mongolia	26.94	NR
49	2	3	Hansel McCaig	Fiji	26.97	NR
50	2	4	Andrej Stojanovski	North Macedonia	27.35	NR
51	1	6	Tameea Elhamayda	Qatar	27.41
52	3	9	Warren Lawrence	Dominica	27.45
53	2	2	Mohamad Zubaid	Kuwait	27.64
54	2	5	Bede Aitu	Cook Islands	28.19
55	2	6	Jeno Heyns	Suriname	28.30
56	2	7	Tajhari Williams	Turks and Caicos Islands	29.44
57	1	7	Omer Huraish	Iraq	29.88
58	1	2	Kapeli Siua	Tonga	29.96
59	2	1	Swaleh Talib	Suspended Member Federation	30.03
60	2	9	Troy Pino	Cape Verde	30.85
61	2	8	Alexander Fleming-Lake	Anguilla	30.89
62	2	0	Mohamed Shiham	Maldives	31.44
63	1	5	Giorgio Nguichie Kamseu Kamogne	Cameroon	33.75
64	1	3	Hamzah Mayas	Yemen	39.35
	1	1	Ibrahim Kamara	Sierra Leone	Did not start
	3	4	Dylan Carter	Trinidad and Tobago
	5	8	Bradley Woodward	Australia

Semifinals

The semifinal was held on 29 July at 21:06.^[6]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	2	4	Justin Ress	United States	24.35	Q
2	1	3	Xu Jiayu	China	24.41	Q, NR
2	2	5	Hunter Armstrong	United States	24.41	Q
4	1	5	Ksawery Masiuk	Poland	24.47	Q
5	1	4	Apostolos Christou	Greece	24.57	Q
5	1	6	Thomas Ceccon	Italy	24.57	Q
7	2	3	Ole Braunschweig	Germany	24.73	Q
8	2	7	Andrew Jeffcoat	New Zealand	24.81	Q
9	2	6	Isaac Cooper	Australia	24.86
10	2	2	Andrei-Mircea Anghel	Romania	24.95
11	1	2	Kacper Stokowski	Poland	24.99
11	2	8	Michael Laitarovsky	Israel	24.99
13	1	7	Conor Ferguson	Ireland	25.09
14	2	1	Takeshi Kawamoto	Japan	25.14
15	1	8	Ryosuke Irie	Japan	25.21
16	1	1	Yassin Hossam	Egypt	25.22

Final

The final will be held on 30 July at 20:02.^[7]

Rank	Lane	Name	Nationality	Time	Notes
	3	Hunter Armstrong	United States	24.05
	4	Justin Ress	United States	24.24
	5	Xu Jiayu	China	24.50
4	6	Ksawery Masiuk	Poland	24.57
5	7	Thomas Ceccon	Italy	24.58
6	2	Apostolos Christou	Greece	24.60
7	8	Andrew Jeffcoat	New Zealand	24.66
8	1	Ole Braunschweig	Germany	24.93