Swimming at the 2015 World Aquatics Championships – Men's 100 metre backstroke
The Men's 100 metre backstroke competition of the swimming events at the 2015 World Aquatics Championships was held on 3 August with the heats and the semifinals and 4 August with the final.Records
Prior to the competition, the existing world and championship records were as follows.Results
Heats
The heats were held on 3 August at 09:49.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 5 | Mitch Larkin | | 52.50 | Q, OC |
| 2 | 7 | 4 | Matt Grevers | | 53.21 | Q |
| 3 | 6 | 4 | Xu Jiayu | | 53.29 | Q |
| 4 | 6 | 6 | Liam Tancock | | 53.35 | Q |
| 5 | 7 | 5 | Ryosuke Irie | | 53.37 | Q |
| 6 | 6 | 3 | Guilherme Guido | | 53.57 | Q |
| 7 | 5 | 4 | | | 53.64 | Q |
| 8 | 5 | 2 | Grigory Tarasevich | | 53.69 | Q |
| 9 | 7 | 3 | Evgeny Rylov | | 53.74 | Q |
| 10 | 6 | 1 | Jan-Philip Glania | | 53.78 | Q |
| 11 | 7 | 6 | Simone Sabbioni | | 53.83 | Q |
| 12 | 5 | 3 | Jérémy Stravius | | 53.92 | Q |
| 12 | 6 | 2 | Camille Lacourt | | 53.92 | Q |
| 12 | 7 | 7 | Yakov Toumarkin | | 53.92 | Q |
| 15 | 5 | 6 | Ben Treffers | | 54.00 | Q |
| 16 | 5 | 5 | David Plummer | | 54.06 | Q |
| 17 | 7 | 2 | Masaki Kaneko | | 54.19 | |
| 18 | 5 | 1 | Radosław Kawęcki | | 54.20 | |
| 19 | 6 | 8 | Tomasz Polewka | | 54.26 | |
| 20 | 5 | 9 | Li Guangyuan | | 54.34 | |
| 21 | 7 | 9 | Quah Zheng Wen | | 54.40 | NR |
| 22 | 7 | 0 | Corey Main | | 54.51 | |
| 23 | 4 | 4 | Gábor Balog | | 54.65 | |
| 24 | 7 | 8 | Christian Diener | | 54.75 | |
| 25 | 6 | 0 | Park Seon-kwan | | 54.80 | |
| 26 | 6 | 7 | Christopher Ciccarese | | 54.81 | |
| 26 | 6 | 9 | Juan Miguel Rando | | 54.81 | |
| 28 | 5 | 0 | Danas Rapšys | | 54.86 | |
| 29 | 5 | 7 | Russell Wood | | 54.90 | |
| 30 | 4 | 3 | Robert Glință | | 55.07 | |
| 31 | 7 | 1 | Apostolos Christou | | 55.10 | |
| 32 | 4 | 1 | Ralf Tribuntsov | | 55.13 | NR |
| 33 | 4 | 0 | Dylan Carter | | 55.24 | |
| 34 | 4 | 5 | Lavrans Solli | | 55.28 | |
| 35 | 5 | 8 | Pavel Sankovich | | 55.79 | |
| 36 | 3 | 3 | Mohamed Hussein | | 55.85 | |
| 37 | 3 | 8 | Rexford Tullius | | 55.88 | |
| 38 | 4 | 7 | Omar Pinzón | | 55.90 | |
| 39 | 3 | 4 | Lukas Rauftlin | | 56.11 | |
| 40 | 4 | 6 | Janis Šaltans | | 56.15 | |
| 41 | 3 | 6 | Ryan Pini | | 56.39 | |
| 41 | 4 | 9 | I Gede Siman Sudartawa | | 56.39 | |
| 43 | 3 | 5 | Doruk Tekin | | 56.57 | |
| 44 | 4 | 8 | Lê Nguyễn Paul | | 56.95 | |
| 45 | 3 | 7 | Petar Petrović | | 57.44 | |
| 46 | 2 | 6 | Timothy Wynter | | 57.47 | |
| 47 | 2 | 2 | Boris Kirillov | | 57.50 | |
| 48 | 3 | 9 | Martin Zhelev | | 57.55 | |
| 49 | 2 | 3 | Merdan Ataýew | | 57.57 | |
| 50 | 3 | 0 | Charles Hockin | | 57.84 | |
| 51 | 2 | 1 | David van der Colff | | 57.95 | |
| 52 | 3 | 1 | Jamal Chavoshifar | | 58.75 | |
| 53 | 1 | 5 | Eisner Barbarena | | 58.95 | |
| 54 | 2 | 5 | Ngou Pok Man | | 59.12 | |
| 55 | 2 | 0 | Jean Gómez | | 59.69 | |
| 56 | 2 | 9 | Lushano Lamprecht | | 59.77 | |
| 57 | 1 | 4 | Hamdan Bayusuf | | | |
| 58 | 2 | 8 | Driss Lahrichi | | | |
| 59 | 1 | 3 | Adel Elfakir | | | |
| 60 | 2 | 7 | Yaaqoub Al-Saadi | | | |
| 61 | 1 | 2 | Mohammed Bedour | | | |
| 62 | 1 | 7 | Mohammad Ahmed | | | |
| 63 | 1 | 1 | Farhan Saleh | | | |
| 64 | 1 | 8 | Noah Al-Khulaifi | | | |
| 65 | 1 | 6 | Arnold Kisulo | | | |
| 66 | 1 | 0 | Temaruata Strickland | | | |
| 67 | 1 | 9 | Htut Ahnt Khaung | | | |
| 2 | 4 | Daniel Ramírez | | | |
| 4 | 2 | Albert Subirats | | | |
| 3 | 2 | Armando Barrera | | | |
Semifinals
The semifinals were held on 3 August at 17:48.Semifinal 1
Semifinal 2
Final
The final was held on 4 August at 18:36.
| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Mitch Larkin | | 52.40 | |
| 5 | Camille Lacourt | | 52.48 | |
| 3 | Matt Grevers | | 52.66 | |
| 4 | 7 | Xu Jiayu | | 52.89 | |
| 5 | 8 | Chris Walker-Hebborn | | 53.02 | |
| 6 | 6 | Ryosuke Irie | | 53.10 | |
| 7 | 2 | Evgeny Rylov | | 53.23 | |
| 8 | 1 | Liam Tancock | | 53.37 | |
