| Event: | Men's 100 metre backstroke |
| Games: | 2015 |
| Venue: | CIBC Pan Am/Parapan Am Aquatics Centre and Field House |
| Dates: | July 17 (preliminaries and finals) |
| Competitors: | 16 |
| Nations: | 13 |
| Win Value: | 53.20 |
| Win Label: | Winning time |
| Gold: | Nick Thoman |
| Goldnoc: | USA |
| Silver: | Guilherme Guido |
| Silvernoc: | BRA |
| Bronze: | Eugene Godsoe |
| Bronzenoc: | USA |
| Prev: | 2011 |
| Next: | 2019 |
The men's 100 metre backstroke competition of the swimming events at the 2015 Pan American Games took place on July 17 at the CIBC Pan Am/Parapan Am Aquatics Centre and Field House in Toronto, Canada.[1] The defending Pan American Games champion was Thiago Pereira of Brazil.
This race consisted of two lengths of the pool, both lengths in backstroke. The top eight swimmers from the heats would qualify for the A final (where the medals would be awarded), while the next best eight swimmers would qualify for the B final.[2]
Prior to this competition, the existing world and Pan American Games records were as follows:
| World record | 51.94 | Indianapolis, United States | July 8, 2009 | ||
| Pan American Games record | 53.66 | Rio de Janeiro, Brazil | July 22, 2007 |
See main article: Swimming at the 2015 Pan American Games – Qualification. Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the A standard (56.59) in the qualifying period (January 1, 2014 to May 1, 2015). NOCs were also permitted to enter one athlete providing they had met the B standard (59.99) in the same qualifying period.[2] All other competing athletes were entered as universality spots.[2]
All times are Eastern Time Zone (UTC-4).
| Date | Time | Round | |
|---|---|---|---|
| July 17, 2015 | 10:18 | Heats | |
| July 17, 2015 | 19:18 | Final B | |
| July 17, 2015 | 19:24 | Final A |
| KEY: | bgcolor=ccffcc align=center | q | Fastest non-qualifiers | bgcolor=ccffcc align=center | Q | Qualified | GR | Games record | NR | National record | PB | Personal best | SB | Seasonal best |
The first round was held on July 17.[3]
| Rank | Heat | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|---|
| 1 | 2 | 4 | 54.04 | QA | |||
| 2 | 3 | 4 | 54.35 | QA | |||
| 3 | 2 | 5 | 54.38 | QA | |||
| 4 | 1 | 4 | 54.55 | QA | |||
| 5 | 1 | 5 | 54.87 | QA | |||
| 6 | 2 | 3 | 54.94 | QA | |||
| 7 | 1 | 3 | 55.24 | QA | |||
| 8 | 3 | 3 | 55.26 | QA | |||
| 9 | 3 | 6 | 56.14 | QB | |||
| 10 | 3 | 2 | 56.56 | QB | |||
| 11 | 1 | 6 | 57.08 | QB | |||
| 12 | 1 | 2 | 57.22 | QB | |||
| 13 | 2 | 6 | 57.38 | QB | |||
| 14 | 3 | 7 | 57.86 | QB | |||
| 15 | 2 | 2 | 58.15 | QB | |||
| 16 | 1 | 7 | 59.15 | QB | |||
| 2 | 7 | DNS | |||||
| 3 | 5 | DNS |
The B final was also held on July 17.[4]
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 9 | 4 | 56.14 | ||||
| 10 | 2 | 56.91 | ||||
| 11 | 5 | 57.25 | ||||
| 12 | 6 | 57.30 | ||||
| 13 | 7 | 57.47 | ||||
| 14 | 3 | 57.92 | ||||
| 15 | 1 | 57.93 | ||||
| 16 | 8 | 59.14 |
The A final was also held on July 17.[5]
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 5 | 53.20 | GR | ||||
| 4 | 53.35 | |||||
| 3 | 53.96 | |||||
| 4 | 6 | 54.30 | ||||
| 5 | 2 | 54.61 | ||||
| 6 | 7 | 55.22 | ||||
| 7 | 8 | 55.52 | ||||
| 8 | 1 | 56.09 |