Swimming at the 2024 World Aquatics Championships – Men's 50 metre backstroke

Prior to the competition, the existing world and championship records were as follows.^[3]

World record	Kliment Kolesnikov (RUS)	23.55	Kazan, Russia	27 July 2023
Competition record	Liam Tancock (GBR)	24.04	Rome, Italy	2 August 2009

The heats were held on 17 February at 09:57.^[4]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	5	5	Ksawery Masiuk	Poland	24.58	Q
1	5	4	Hunter Armstrong	United States	24.66	Q
3	3	7	Hugo González	Spain	24.72	Q
4	3	4	Isaac Cooper	Australia	24.75	Q
4	4	4	Pieter Coetze	South Africa	24.75	Q
6	4	5	Michael Andrew	United States	24.82	Q
7	5	6	Michele Lamberti	Italy	24.88	Q
8	5	3	Ole Braunschweig	Germany	24.94	Q
9	5	7	Yoon Ji-hwan	South Korea	25.01	Q
10	3	2	Ulises Saravia	Argentina	25.02	Q
11	3	5	Apostolos Christou	Greece	25.03	Q
12	4	7	Björn Seeliger	Sweden	25.10	Q
13	4	3	Miroslav Knedla	Czech Republic	25.14	Q
14	5	8	Adrian Santos	Spain	25.15	Q
15	3	3	Andrew Jeffcoat	New Zealand	25.16	Q
16	3	1	Evangelos Makrygiannis	Greece	25.18	Q
17	3	6	Javier Acevedo	Canada	25.28
18	4	1	Bradley Woodward	Australia	25.41
19	2	4	Ádám Jászó	Hungary	25.43
20	5	2	Oleksandr Zheltiakov	Ukraine	25.60
21	5	1	Lamar Taylor	Bahamas	25.80
22	2	7	Dimuth Peiris	Sri Lanka	25.86
23	5	0	Jerard Jacinto	Philippines	25.92
24	5	9	Diego Camacho	Mexico	25.97
25	3	9	Dino Hasibović	Bosnia and Herzegovina	26.06
25	4	8	I Gede Siman Sudartawa	Indonesia	26.06
27	2	6	Ģirts Feldbergs	Latvia	26.08
28	3	8	Yeziel Morales	Puerto Rico	26.17
29	2	3	Kaloyan Levterov	Bulgaria	26.25
29	2	8	Merdan Ataýew	Turkmenistan	26.25
31	4	9	Bernhard Reitshammer	Austria	26.33
32	4	6	Andrei-Mircea Anghel	Romania	26.36
33	2	2	Xu Yifan	China	26.37
34	2	5	Filippos Iakovidis	Cyprus	26.43
35	4	0	Charles Hockin	Paraguay	26.45
36	2	9	Erkhes Enkhtur	Mongolia	26.72
37	2	1	Lau Shiu Yue	Hong Kong	26.74
38	1	4	Guido Montero	Costa Rica	27.71
39	1	5	Oscar Peyre	Rwanda	27.79
40	2	0	Antoine De Lapparent	Cambodia	27.93
41	1	6	Tajhari Williams	Turks and Caicos Islands	28.78
42	1	3	Hasan Al-Zinkee	Iraq	28.97
43	1	1	Brandon George	Saint Vincent and the Grenadines	29.16
44	1	2	Giorgio Nguichie	Cameroon	33.95
–	1	7	Ibrahim Kamara	Sierra Leone	Did not start
	1	8	Yousef Al-Khulaifi	Qatar
	4	2	Conor Ferguson	Ireland
	3	0	Mantas Kauspedas	Lithuania	Disqualified

The semifinals were held on 17 February at 20:06.^[5]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	1	5	Isaac Cooper	Australia	24.12	Q, OC
2	1	4	Hunter Armstrong	United States	24.43	Q
3	2	3	Pieter Coetze	South Africa	24.46	Q
3	2	4	Ksawery Masiuk	Poland	24.46	Q
5	2	5	Hugo González	Spain	24.60	Q
6	2	6	Michele Lamberti	Italy	24.68	Q
7	1	3	Michael Andrew	United States	24.70	Q
8	1	6	Ole Braunschweig	Germany	24.74	Q
9	1	8	Evangelos Makrygiannis	Greece	24.84
10	2	8	Andrew Jeffcoat	New Zealand	24.88
11	2	7	Apostolos Christou	Greece	25.01
12	2	1	Miroslav Knedla	Czech Republic	25.06
13	1	1	Adrian Santos	Spain	25.09
14	1	7	Björn Seeliger	Sweden	25.10
15	1	2	Ulises Saravia	Argentina	25.13
16	2	2	Yoon Ji-hwan	South Korea	25.14

The final was held on 18 February at 19:02.^[6]

Rank	Lane	Name	Nationality	Time	Notes
	4	Isaac Cooper	Australia	24.13
	5	Hunter Armstrong	United States	24.33
	6	Ksawery Masiuk	Poland	24.44	=NR
4	3	Pieter Coetze	South Africa	24.59
5	8	Ole Braunschweig	Germany	24.74
6	2	Hugo González	Spain	24.77
7	7	Michele Lamberti	Italy	24.82
8	1	Michael Andrew	United States	24.86