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

Men's 100 metre butterfly at the Games of the XXXIII Olympiad
Venue	Olympic Aquatics Centre, Paris La Défense Arena
Dates	2 August 2024 (Heats and Semis) 3 August 2024 (Final)
Competitors	40 from 31 nations
Winning time	49.90
Medalists
Kristóf Milák  Hungary Joshua Liendo  Canada Ilya Kharun  Canada

The men's 100 metre butterfly event at the 2024 Summer Olympics was held from 2 to 3 August 2024 at the Paris Aquatics Centre.

Records

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

World record	Caeleb Dressel (USA)	49.45	Tokyo, Japan	31 July 2021
Olympic record	Caeleb Dressel (USA)	49.45	Tokyo, Japan	31 July 2021

Qualification

Main article: Swimming at the 2024 Summer Olympics – Qualification

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).

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.

Time standards

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.

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

Men's events
Event	OQT*	OCT^
100 m butterfly	51.67	51.93

* 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.

ª Because the fourteenth-place swimmer achieved a standard slower than the OQT in Tokyo 2020, the OQT used at the previous Games will remain constant.

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

Competition format

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.

Schedule

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

Date	Time	Round
2 August 2024	10:00	Heats
	20:00	Semifinals
3 August 2024	19:30	Final

Results

Heats

Rank	Heat	Lane	Swimmer	Nation	Time	Notes
1	3	5	Kristof Milak	Hungary	50.19	Q
2	5	4	Josh Liendo	Canada	50.55	Q
3	3	4	Noe Ponti	Switzerland	50.65	Q
	4	4	Maxime Grousset	France	50.65	Q
5	5	2	Ilya Kharun	Canada	50.71	Q
6	5	5	Caeleb Dressel	United States	50.83	Q
7	4	5	Matthew Temple	Australia	50.89	Q
8	5	3	Nyls Korstanje	Netherlands	51.17	Q
9	4	6	Jakub Majerski	Poland	51.18	Q
10	3	6	Gal Cohen Groumi	Israel	51.30	Q
11	5	1	Ben Armbruster	Australia	51.33	Q
12	5	6	Katsuhiro Matsumoto	Japan	51.43	Q
13	4	7	Simon Bucher	Austria	51.55	Q
14	3	3	Hubert Kós	Hungary	51.58	Q
15	4	1	Naoki Mizunuma	Japan	51.62	Q
	5	7	Clement Secchi	France	51.62	Q
17	3	8	Josif Miladinov	Bulgaria	51.77
18	4	3	Thomas Heilman	United States	51.82
19	2	6	Sun Jiajun	China	51.85
20	3	2	Diogo Ribeiro	Portugal	51.90
21	4	2	Tomer Frankel	Israel	51.94
22	4	8	Kayky Mota	Brazil	52.11
23	5	8	James Guy	Great Britain	52.23
24	2	5	Chad le Clos	South Africa	52.24
25	2	4	Mario Mollà	Spain	52.27
26	3	7	Wang Changhao	China	52.37
27	3	1	Daniel Gracik	Czech Republic	52.61
28	2	3	Kaii Winkler	Germany	52.64
29	2	7	Adilbek Mussin	Kazakhstan	52.74
30	1	2	Nikola Miljenic	Croatia	53.32
31	1	3	Jesse Ssuubi Ssengonzi	Uganda	53.76
32	2	1	Cameron Gray	New Zealand	53.83
33	1	5	Joe Kurniawan	Indonesia	53.95
34	1	4	Milos Milenkovic	Montenegro	54.26
35	2	2	Matthew Sates	South Africa	54.53
36	1	6	Josh Kirlew	Jamaica	54.66
	2	8	Jarod Hatch	Philippines	54.66
38	1	7	Oscar Cyusa Peyre Mitilla	Rwanda	58.77
39	1	1	Hasan Ali Khaleel Al-Zinkee	Iraq	1:00.23
40	1	8	Yusuf Marwan Abdullah Nasser	Yemen	1:08.72

Semifinals

The swimmers with the best 8 times, regardless of semis, advanced to the final.

Rank	Heat	Lane	Swimmer	Nation	Time	Notes
1	2	4	Kristof Milak	Hungary	50.38	Q
2	1	5	Maxime Grousset	France	50.41	Q
3	1	4	Josh Liendo	Canada	50.42	Q
4	1	6	Nyls Korstanje	Netherlands	50.59	Q, NR
5	2	5	Noe Ponti	Switzerland	50.60	Q
6	2	3	Ilya Kharun	Canada	50.68	Q
7	2	6	Matthew Temple	Australia	50.95	Q
8	2	8	Naoki Mizunuma	Japan	51.08	Q
9	2	7	Ben Armbruster	Australia	51.17
10	2	1	Simon Bucher	Austria	51.35
11	2	2	Jakub Majerski	Poland	51.37
12	1	2	Gal Cohen Groumi	Israel	51.48
13	1	3	Caeleb Dressel	United States	51.57
14	1	8	Clement Secchi	France	51.58
15	1	7	Katsuhiro Matsumoto	Japan	51.69
16	1	1	Hubert Kós	Hungary	52.22

Final

Rank	Lane	Swimmer	Nation	Time	Notes
	4	Kristof Milak	Hungary	49.90
	3	Josh Liendo	Canada	49.99	NR
	7	Ilya Kharun	Canada	50.45
4	2	Noe Ponti	Switzerland	50.55
5	5	Maxime Grousset	France	50.75
6	6	Nyls Korstanje	Netherlands	50.83
7	1	Matthew Temple	Australia	51.10
8	8	Naoki Mizunuma	Japan	51.11