The Men's 50m backstroke event at the 2010 South American Games was held on March 29, with the heats at 10:06 and the Final at 18:00.
The IX South American Games was a multi-sport event held between 19–30 March 2010 in Medellín, Colombia. The Games were organized by the South American Sports Organization (ODESUR), who awarded the Games to the city with 8 votes over the bid by previous host Santiago, Chile.
| Gold | Silver | Bronze |
Guilherme Guido  | Federico Grabich  | Daniel Orzechowski |
| Standing records prior to the 2010 South American Games | ||||
|---|---|---|---|---|
| World record |  | 24.04 | Rome, Italy | 2 August 2009 |
| Competition Record | | 26.25 | Buenos Aires, Argentina | 18 November 2006 |
| South American record | | 24.49 | Rome, Italy | 1 August 2009 |
| Rank | Heat | Lane | Athlete | Result | Notes |
|---|---|---|---|---|---|
| 1 | 3 | 4 | | 25.47 | Q CR |
| 2 | 2 | 4 | | 26.05 | Q |
| 3 | 1 | 4 | | 26.37 | Q |
| 4 | 3 | 5 |  | 26.71 | Q |
| 5 | 2 | 5 |  | 26.77 | Q |
| 6 | 3 | 3 |  | 27.20 | Q |
| 7 | 2 | 6 |  | 27.19 | Q |
| 8 | 2 | 3 | | 27.48 | Q |
| 9 | 1 | 5 | | 27.69 | |
| 10 | 1 | 6 | | 27.74 | |
| 11 | 1 | 3 | | 27.94 | |
| 12 | 3 | 2 |  | 27.99 | |
| 13 | 3 | 6 |  | 28.41 | |
| 14 | 1 | 2 |  | 28.65 | |
| 15 | 2 | 7 |  | 29.04 | |
| 16 | 2 | 2 | | 29.09 | |
| 17 | 3 | 7 | | 30.03 | |
| 18 | 1 | 7 |  | 30.88 | |
| Rank | Lane | Athlete | Result | Notes |
|---|---|---|---|---|
 | 4 | | 25.09 | CR |
 | 3 | | 25.69 | |
 | 5 | | 26.05 | |
| 4 | 2 | | 26.35 | |
| 4 | 6 | | 26.35 | |
| 6 | 1 | | 26.97 | |
| 7 | 7 | | 27.62 | |
| 8 | 8 | | 28.07 | |
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