# Athletics at the 1955 Pan American Games – Men's 100 metres

The men's 100 metres event at the 1955 Pan American Games was held at the Estadio Universitario in Mexico City on 13 and 14 March.

## Results
### Heats

Held on 13 March

#### Heat 1

| Rank | Athlete | Nation | Time | Notes |
| 1 | Dean Smith | United States | 10.84 | Q |
| 2 | Ciro Brazeiro | Uruguay | 11.27 | Q |
| 3 | Tom Robinson | Bahamas | 11.32 | Q |
| 4 | Alexis Bloem | Netherlands Antilles | 11.44 | |

#### Heat 2

| Rank | Athlete | Nation | Time | Notes |
| 1 | Harry Nelson | Canada | 10.88 | Q |
| 2 | Rafael Fortún | Cuba | 10.91 | Q |
| 3 | Domingo García | Dominican Republic | 11.20 | Q |
| 4 | Javier Souza | Mexico | 11.28 | |
| 5 | Antonio Vanegas | Colombia | 11.63 | |

#### Heat 3

| Rank | Athlete | Nation | Time | Notes |
| 1 | Willie Williams | United States | 10.80 | Q |
| 2 | René Ahumada | Mexico | 10.91 | Q |
| 3 | Apolinar Solórzano | Venezuela | 11.07 | Q |
| 4 | Franz Lara | Costa Rica | 11.30 | |
| | Eligio Rivas | Dominican Republic | DQ | |

#### Heat 4

| Rank | Athlete | Nation | Time | Notes |
| 1 | Mike Agostini | Trinidad and Tobago | 10.67 | Q |
| 2 | Bruce Springbett | Canada | 11.04 | Q |
| 3 | Raúl Zabala | Argentina | 11.21 | Q |
| 4 | Carlos Vera | Chile | 11.32 | |
| 5 | José García | Venezuela | 11.56 | |

#### Heat 5

| Rank | Athlete | Nation | Time | Notes |
| 1 | Rod Richard | United States | 10.73 | Q |
| 2 | Clive Bonas | Venezuela | 10.86 | Q |
| 3 | Keith Gardner | Jamaica | 10.89 | Q |
| 4 | Carlos Sierra | Colombia | 11.61 | |
| | Leonard Dames | Bahamas | DNS | |

#### Heat 6

| Rank | Athlete | Nation | Time | Notes |
| 1 | José da Conceição | Brazil | 11.06 | Q |
| 2 | Luis Soriano | Dominican Republic | 11.22 | Q |
| 3 | Eduardo Basilio Ríos | Argentina | 11.31 | Q |
| 4 | Antonio Rodríguez | Mexico | 11.53 | |
| | Gilberto Fonseca | Netherlands Antilles | DQ | |

### Semifinals

Held on 14 March

#### Heat 1

| Rank | Athlete | Nation | Time | Notes |
| 1 | Dean Smith | United States | 10.65 | Q, GR |
| 2 | Rafael Fortún | Cuba | 10.69 | Q |
| 3 | Harry Nelson | Canada | 10.87 | |
| 4 | Domingo García | Dominican Republic | 11.05 | |
| 5 | Tom Robinson | Bahamas | 11.26 | |
| | Ciro Brazeiro | Uruguay | DNS | |

#### Heat 2

| Rank | Athlete | Nation | Time | Notes |
| 1 | Willie Williams | United States | 10.53 | Q, GR |
| 2 | Mike Agostini | Trinidad and Tobago | 10.54 | Q |
| 3 | Apolinar Solórzano | Venezuela | 11.02 | |
| 4 | Bruce Springbett | Canada | 11.10 | |
| 5 | René Ahumada | Mexico | 11.12 | |
| 6 | Raúl Zabala | Argentina | 11.53 | |

#### Heat 3

| Rank | Athlete | Nation | Time | Notes |
| 1 | Rod Richard | United States | 10.44 | Q, GR |
| 2 | Keith Gardner | Jamaica | 10.63 | Q |
| 3 | Clive Bonas | Venezuela | 10.75 | |
| 4 | José da Conceição | Brazil | 10.76 | |
| 5 | Eduardo Basilio Ríos | Argentina | 11.05 | |
| 6 | Luis Soriano | Dominican Republic | 11.17 | |

### Final

Held on 14 March
| Rank | Name | Nationality | Time | Notes |
| | Rod Richard | United States | 10.3 | =GR |
| | Mike Agostini | Trinidad and Tobago | 10.4 | |
| | Willie Williams | United States | 10.4 | |
| 4 | Keith Gardner | Jamaica | 10.5 | |
| 5 | Rafael Fortún | Cuba | 10.6 | |
| | Dean Smith | United States | DNF | |