Swimming at the 2024 Summer Olympics – Men's 100 metre breaststroke

Prior to this competition, the existing world and Olympic records were as follows:

World record	Adam Peaty (GBR)	56.88	Gwangju, South Korea	21 July 2019	[2]
Olympic record	Adam Peaty (GBR)	57.13	Rio de Janeiro, Brazil	7 August 2016	[3][4]

A National Olympic Committee (NOC) may enter a maximum of two qualified athletes in each individual event, but only if both of them have attained the Olympic Qualifying Time (OQT). One athlete per event can potentially enter if they meet the Olympic Consideration Time (OCT), or if the total quota of 852 athletes has not been targeted. NOCs may also permit swimmers regardless of time (one per gender) under a Universality place since they have no swimmers attaining either of the standard entry times (OQT/OCT).^[5][6]

Following the end of the qualification window, World Aquatics will assess the number of swimmers who have achieved the OQT, the number of relay-only swimmers, and the number of Universality places, before inviting those with OCT to fulfill the total quota of 852. Additionally, OCT places will be distributed by event according to the position of the World Aquatics Rankings during the qualifying deadline.^[5]

The qualifying time standards must be obtained at the 2023 and 2024 World Championships, continental championships, continental swimming meets, national championships and selection trials, and various international meets approved by World Aquatics in the period between 1 March 2023 and 23 June 2024.^[7]

The following table outlines the qualifying time standards for Paris 2024 for this event:

* OQTs correspond to the time achieved by a fourteenth-place swimmer in his or her respective preliminary heat of each event at the previous Games.

^ OCTs are derived by adding 0.5% of the OQT standard.

The competition consists of three rounds: heats, semifinals, and a final. The swimmers with the best 16 times in the heats advance to the semifinals. The swimmers with the best 8 times in the semifinals advance to the final. Swim-offs are used as necessary to break ties for advancement to the next round.

All times are Central European Summer Time (UTC+2)

Rank	Heat	Lane	Swimmer	Nation	Time	Notes
1	3	6	Caspar Corbeau	Netherlands	59.04	Q
2	4	4	Adam Peaty	Great Britain	59.18	Q
3	4	7	Ilya Shymanovich	Individual Neutral Athletes	59.25	Q
4	4	5	Nicolò Martinenghi	Italy	59.39	Q
	5	5	Arno Kamminga	Netherlands	59.39	Q
6	4	1	James Wilby	Great Britain	59.40	Q
7	5	6	Melvin Imoudu	Germany	59.49	Q
8	4	3	Lucas Matzerath	Germany	59.52	Q
9	5	4	Qin Haiyang	China	59.58	Q
10	3	4	Nic Fink	United States	59.66	Q
11	4	8	Bernhard Reitshammer	Austria	59.68	Q
12	3	1	Joshua Yong	Australia	59.75	Q
13	3	5	Evgenii Somov	Individual Neutral Athletes	59.83	Q
14	4	6	Charlie Swanson	United States	59.92	Q
15	3	2	Ludovico Blu Art Viberti	Italy	59.93	Q
16	3	8	Ron Polonsky	Israel	1:00.00	Q, NR
17	5	3	Sun Jiajun	China	1:00.11
18	5	7	Choi Dong-yeol	South Korea	1:00.17
19	3	7	Taku Taniguchi	Japan	1:00.20
20	4	2	Andrius Šidlauskas	Lithuania	1:00.29
21	5	2	Berkay Ömer Öğretir	Turkey	1:00.36
22	5	8	Jan Kałusowski	Poland	1:00.40
23	5	1	Denis Petrashov	Kyrgyzstan	1:00.42
24	3	3	Sam Williamson	Australia	1:00.50
25	2	5	Anton McKee	Iceland	1:00.62
26	2	6	Jadon Wuilliez	Antigua and Barbuda	1:02.70
27	2	2	Adrian Robinson	Botswana	1:02.79
28	2	3	Alexandre Grand'Pierre	Haiti	1:02.85
29	2	1	Tasi Limtiaco	Federated States of Micronesia	1:04.14
30	2	8	Abdulaziz Al-Obaidly	Qatar	1:04.31
31	1	4	Steven Insixiengmay	Laos	1:04.64
32	1	3	Matthew Lawrence	Mozambique	1:04.95
33	2	7	Jonathan Raharvel	Madagascar	1:05.20
34	1	5	Micah Masei	American Samoa	1:05.95
35	1	6	Chadd Ng Chiu Hing Ning	Eswatini	1:09.85
	2	4	Miguel de Lara	Mexico	DSQ

^[8]

The swimmers with the best 8 times, regardless of heat, advanced to the final.^[9]

Rank	Heat	Lane	Swimmer	Nation	Time	Notes
1	1	4	Adam Peaty	Great Britain	58.86	Q
2	2	2	Qin Haiyang	China	58.93	Q
3	2	3	Arno Kamminga	Netherlands	59.12	Q
4	1	2	Nic Fink	United States	59.16	Q
5	2	4	Caspar Corbeau	Netherlands	59.24	Q
6	1	5	Nicolò Martinenghi	Italy	59.28	Q
7	1	6	Lucas Matzerath	Germany	59.31	Q
8	2	6	Melvin Imoudu	Germany	59.38	QSO
	2	8	Ludovico Blu Art Viberti	Italy	59.38	QSO
10	2	5	Ilya Shymanovich	Individual Neutral Athletes	59.45
11	1	3	James Wilby	Great Britain	59.49
12	1	7	Joshua Yong	Australia	59.64
13	2	1	Evgenii Somov	Individual Neutral Athletes	1:00.00
14	1	1	Charlie Swanson	United States	1:00.16
15	2	7	Bernhard Reitshammer	Austria	1:00.18
16	1	8	Ron Polonsky	Israel	1:00.37

Swim-off

Rank	Lane	Swimmer	Nation	Time	Notes
1	4	Melvin Imoudu	Germany	59.69	Q
2	5	Ludovico Blu Art Viberti	Italy	59.90

^[10]

Rank	Lane	Swimmer	Nation	Time	Notes
	7	Nicolò Martinenghi	Italy	59.03
	4	Adam Peaty	Great Britain	59.05
	6	Nic Fink	United States	59.05
4	8	Melvin Imoudu	Germany	59.11
5	1	Lucas Matzerath	Germany	59.30
6	3	Arno Kamminga	Netherlands	59.32
7	5	Qin Haiyang	China	59.50
8	2	Caspar Corbeau	Netherlands	59.98

^[11]