Swimming at the 2015 World Aquatics Championships – Men's 100 metre breaststroke
The Men's 100 metre breaststroke competition of the swimming events at the 2015 World Aquatics Championships was held on 2 August with the heats and the semifinals and 3 August with the final.Records
Prior to the competition, the existing world and championship records were as follows.
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 2 August | Heat 9 | Adam Peaty | | 58.52 | CR |
| 2 August | Semifinal 1 | Cameron van der Burgh | | 58.49 | CR |
| 2 August | Semifinal 2 | Adam Peaty | | 58.18 | CR |
Results
Heats
The heats were held at 11:34.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 9 | 4 | Adam Peaty | | | Q, CR |
| 2 | 8 | 5 | Cameron van der Burgh | | | Q |
| 3 | 9 | 2 | Dmitriy Balandin | | | Q |
| 4 | 7 | 4 | Ross Murdoch | | | Q |
| 5 | 9 | 5 | Felipe França Silva | | | Q |
| 6 | 7 | 6 | Hendrik Feldwehr | | | Q |
| 7 | 9 | 0 | Kirill Prigoda | | | Q |
| 8 | 7 | 5 | Giedrius Titenis | | | Q |
| 9 | 9 | 1 | Jake Packard | | | Q |
| 10 | 7 | 3 | Yasuhiro Koseki | | | Q |
| 11 | 9 | 3 | Cody Miller | | | Q |
| 12 | 7 | 7 | Christian vom Lehn | | 1:00.01 | Q |
| 13 | 8 | 7 | Nic Fink | | 1:00.05 | Q |
| 14 | 7 | 1 | Richard Funk | | 1:00.26 | Q |
| 14 | 9 | 6 | Felipe Lima | | 1:00.26 | Q |
| 16 | 8 | 6 | Čaba Silađi | | 1:00.35 | Q |
| 17 | 8 | 8 | Damir Dugonjič | | 1:00.36 | |
| 18 | 9 | 7 | Glenn Snyders | | 1:00.44 | |
| 19 | 6 | 4 | Anton Sveinn McKee | | 1:00.53 | |
| 20 | 6 | 2 | Vladislav Mustafin | | 1:00.63 | |
| 21 | 6 | 7 | Jorge Murillo | | 1:00.67 | |
| 22 | 8 | 3 | Dániel Gyurta | | 1:00.71 | |
| 23 | 9 | 8 | Tomáš Klobučník | | 1:00.77 | |
| 24 | 8 | 1 | Giacomo Perez d'Ortona | | 1:00.80 | |
| 25 | 8 | 0 | Laurent Carnol | | 1:00.82 | |
| 26 | 6 | 5 | Yannick Käser | | 1:00.94 | |
| 27 | 7 | 2 | Li Xiang | | 1:00.96 | |
| 28 | 8 | 4 | Christian Sprenger | | 1:01.13 | |
| 29 | 8 | 2 | Ryo Tateishi | | 1:01.26 | |
| 30 | 6 | 0 | Matti Mattsson | | 1:01.44 | |
| 31 | 7 | 9 | Carlos Claverie | | 1:01.63 | |
| 32 | 6 | 3 | Erik Persson | | 1:01.75 | |
| 33 | 8 | 9 | Marcin Stolarski | | 1:01.98 | |
| 34 | 9 | 9 | Martti Aljand | | 1:01.99 | |
| 35 | 5 | 5 | Youssef El-Kamash | | 1:02.01 | NR |
| 36 | 6 | 1 | Sandeep Sejwal | | 1:02.17 | |
| 37 | 7 | 8 | Lorenzo Antonelli | | 1:02.20 | |
| 38 | 6 | 8 | Alex Murphy | | 1:02.22 | |
| 39 | 6 | 9 | Demir Atasoy | | 1:02.35 | |
| 40 | 5 | 2 | Édgar Crespo | | 1:02.37 | |
| 41 | 5 | 4 | Joshua Hall | | 1:02.40 | |
| 42 | 5 | 6 | Azad Al-Barazi | | 1:02.51 | |
| 43 | 7 | 0 | Panagiotis Samilidis | | 1:02.58 | |
| 44 | 5 | 7 | Renato Prono | | 1:02.69 | |
| 45 | 4 | 4 | Wong Fu Kang | | 1:02.89 | |
| 46 | 6 | 6 | Petr Bartůněk | | 1:02.90 | |
| 47 | 5 | 8 | Lachezar Shumkov | | 1:03.08 | |
| 48 | 5 | 3 | Nikolajs Maskaļenko | | 1:03.21 | |
| 49 | 4 | 3 | Chao Man Hou | | 1:03.46 | |
| 50 | 5 | 1 | Dustin Tynes | | 1:03.50 | |
| 51 | 4 | 8 | Jordy Groters | | 1:03.66 | |
| 52 | 4 | 1 | Julian Fletcher | | 1:03.80 | |
| 53 | 4 | 2 | Benjamin Schulte | | 1:03.84 | |
| 54 | 5 | 9 | Mauro Castillo | | 1:03.91 | |
| 55 | 4 | 9 | James Lawson | | 1:04.03 | |
| 56 | 4 | 6 | Amini Fonua | | 1:04.28 | |
| 57 | 4 | 5 | Malick Fall | | 1:04.30 | |
| 58 | 4 | 7 | Anton Zheltyakov | | 1:04.45 | |
| 59 | 3 | 3 | Arya Nasimi Shad | | 1:05.86 | |
| 60 | 3 | 4 | Jesús Flores | | 1:06.14 | |
| 61 | 3 | 6 | Ramazan Taimatov | | 1:06.49 | |
| 62 | 4 | 0 | Darren Chan | | 1:06.65 | |
| 63 | 3 | 0 | Adriel Sanes | | 1:07.19 | |
| 64 | 3 | 5 | Julian Harding | | 1:07.28 | |
| 65 | 3 | 7 | Alexander Axiotis | | 1:07.29 | |
| 66 | 3 | 8 | Serginni Marten | | 1:07.34 | |
| 67 | 3 | 9 | Nazih Nazeyek | | 1:08.22 | |
| 68 | 3 | 2 | José Alberto Quintanilla | | 1:08.36 | |
| 69 | 2 | 5 | Corey Ollivierre | | 1:08.39 | |
| 70 | 5 | 0 | Mubarak Al-Besher | | 1:09.08 | |
| 71 | 2 | 6 | Kaito Yanai | | 1:09.59 | |
| 72 | 2 | 2 | Nikolas Sylvester | | 1:13.12 | |
| 73 | 2 | 4 | Daniel Gill | | 1:14.02 | |
| 74 | 1 | 4 | Htut Ahnt Khaung | | 1:16.13 | |
| 75 | 2 | 1 | Kiran Karki | | 1:18.21 | |
| 76 | 2 | 8 | Mocheta Makara | | 1:55.91 | |
| 3 | 1 | Markos Kalopsidiotis | | | |
| 1 | 3 | Alhassane Fofana | | | |
| 1 | 5 | Stephane Fokam | | | |
| 2 | 3 | Alassane Seydou | | | |
| 2 | 7 | Simanga Dlamini | | | |
Semifinals
The semifinals were held on 2 August at 18:35.Semifinal 1
Semifinal 2
Final
The final was held on 3 August at 17:32.
| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Adam Peaty | | 58.52 | |
| 5 | Cameron van der Burgh | | 58.59 | |
| 8 | Ross Murdoch | | 59.09 | |
| 4 | 6 | Dmitriy Balandin | | 59.42 | |
| 5 | 1 | Jake Packard | | 59.44 | |
| 6 | 3 | Giedrius Titenis | | 59.56 | |
| 7 | 2 | Kirill Prigoda | | 59.84 | |
| 8 | 7 | Hendrik Feldwehr | | | |
