| Event: | Men's 50m Backstroke |
| Competition: | 2005 FINA World Aquatics Championships |
| Dates: | 30 July (prelims and semifinals) 31 July (final) |
| Competitors: | 68 |
| Nations: | 59 |
| Win Value: | 24.95 seconds |
| Gold: | Aristeidis Grigoriadis |
| Goldnoc: | GRE |
| Silver: | Matt Welsh |
| Silvernoc: | AUS |
| Bronze: | Liam Tancock |
| Bronzenoc: | GBR |
| Prev: | 2003 |
| Next: | 2007 |
See main article: Swimming at the 2005 World Aquatics Championships.
The Men's 50 Backstroke event at the 11th FINA World Aquatics Championships swam on 30 - 31 July 2005 in Montreal, Canada. Preliminary[1] and Semifinal[2] heats swam on 30 July; the Final[3] was 31 July.
Prior to the start of the event, the existing World (WR) and Championship (CR) records were both:
| Place | Swimmer | Nation | Time | Notes |
|---|---|---|---|---|
| 1 | 24.95 | |||
| 2 | 24.99 | |||
| 3 | 25.02 | |||
| 4 | 25.23 | |||
| 5 | 25.30 | |||
| 6 | 25.38 | |||
| 7 | 25.85 | |||
| 8 | 26.48 | |||
| Rank | Swimmer | Nation | Time | Note | |
|---|---|---|---|---|---|
| 1 | 25.11 | Q | |||
| 2 | 25.22 | Q | |||
| 3 | 25.36 | Q | |||
| 4 | 25.52 | Q | |||
| 5 | 25.55 | Q | |||
| 6 | 25.58 | Q | |||
| 7 | 25.60 | Q | |||
| 8 | 25.69 | Q | |||
| 9 | 25.73 | ||||
| 10 | 25.78 | ||||
| 11 | 25.84 | ||||
| 12 | 25.86 | ||||
| 13 | 26.04 | ||||
| 14 | 26.23 | ||||
| 15 | 26.30 | ||||
| 16 | 26.78 | ||||
| Rank | Heat/Lane | Swimmer | Nation | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | H9 L5 | 25.44 | q | |||
| 2 | H7 L4 | 25.46 | q | |||
| 3 | H8 L6 | 25.54 | q | |||
| 4 | H9 L4 | 25.59 | q | |||
| 5 | H8 L4 | 25.64 | q | |||
| 6 | H9 L6 | 25.71 | q | |||
| 7 | H7 L6 | 25.77 | q | |||
| 8 | H8 L3 | 25.79 | q | |||
| 9 | H7 L3 | 25.80 | q | |||
| 10 | H9 L3 | 25.98 | q | |||
| 11 | H7 L5 | 26.02 | q | |||
| 12 | H8 L5 | 26.09 | q | |||
| 13 | H7 L2 | 26.27 | q | |||
| 14 | H8 L7 | 26.30 | q | |||
| 15 | H8 L2 | 26.39 | q | |||
| 16 | H9 L8 | 26.47 | q | |||
| 17 | H9 L2 | 26.49 | ||||
| 18 | H8 L8 | 26.51 | ||||
| 19 | H7 L1 | 26.52 | ||||
| 19 | H9 L1 | 7 26.52 | ||||
| 21 | H8 L1 | 26.55 | ||||
| 21 | H9 L7 | 26.55 | ||||
| 23 | H7 L7 | 26.80 | ||||
| 24 | H4 L6 | 27.20 | ||||
| 25 | H6 L6 | 27.37 | ||||
| 26 | H6 L2 | 27.45 | ||||
| 27 | H6 L7 | 27.63 | ||||
| 28 | H6 L5 | 27.74 | ||||
| 29 | H6 L1 | 28.01 | ||||
| 30 | H5 L4 | 28.02 | ||||
| 31 | H5 L8 | 28.07 | ||||
| 32 | H6 L8 | 28.10 | ||||
| 33 | H4 L8 | 28.21 | ||||
| 34 | H5 L3 | Onan Orlando Thom | 28.22 | |||
| 34 | H5 L6 | 28.22 | ||||
| 36 | H5 L2 | 28.24 | ||||
| 37 | H6 L4 | 28.50 | ||||
| 38 | H4 L5 | 28.52 | ||||
| 39 | H4 L4 | 28.55 | ||||
| 39 | H7 L8 | 28.55 | ||||
| 41 | H5 L7 | 28.74 | ||||
| 42 | H6 L3 | 28.77 | ||||
| 43 | H3 L3 | 28.91 | ||||
| 44 | H5 L1 | 29.07 | ||||
| 45 | H4 L3 | 29.16 | ||||
| 46 | H5 L5 | 29.24 | ||||
| 47 | H3 L4 | 29.31 | ||||
| 48 | H3 L7 | 29.33 | ||||
| 49 | H4 L1 | 29.34 | ||||
| 50 | H3 L6 | 29.92 | ||||
| 50 | H3 L2 | 29.92 | ||||
| 52 | H3 L1 | 30.45 | ||||
| 53 | H2 L5 | 30.59 | ||||
| 54 | H2 L2 | 30.62 | ||||
| 55 | H2 L1 | 30.63 | ||||
| 56 | H3 L5 | 30.70 | ||||
| 57 | H3 L8 | 30.82 | ||||
| 58 | H2 L3 | 31.03 | ||||
| 59 | H2 L4 | 31.38 | ||||
| 60 | H2 L7 | 31.48 | ||||
| 61 | H1 L6 | 31.67 | ||||
| 62 | H2 L8 | 32.24 | ||||
| 63 | H1 L5 | 33.79 | ||||
| - | H1 L3 | DNS | ||||
| - | H1 L4 | DNS | ||||
| - | H2 L6 | DNS | ||||
| - | H4 L2 | DNS | ||||
| - | H4 L7 | DNS | ||||