| Event: | Tennis – Men's singles |
| Games: | 2019 |
| Venue: | Club Lawn Tennis de la Exposición |
| Dates: | July 29 – August 4, 2019 |
| Competitors: | 45 |
| Nations: | 19 |
| Win Label: | Gold medal match score |
| Gold: | João Menezes |
| Goldnoc: | BRA |
| Silver: | Tomás Barrios |
| Silvernoc: | CHI |
| Bronze: | Guido Andreozzi |
| Bronzenoc: | ARG |
| Prev: | 2015 |
| Next: | 2023 |
| Quadrennial: | yes |
| Multi: | yes |
| Type: | mixed |
| Qual Type: | qual |
See main article: article and Tennis at the 2019 Pan American Games.
The men's singles tennis event of the 2019 Pan American Games was held July 29 – August 4 at the Club Lawn Tennis de la Exposición in Lima, Peru.
João Menezes of Brazil won the gold medal, defeating Tomás Barrios of Chile in the final, 7–5, 3–6, 6–4.
Guido Andreozzi of Argentina won the bronze medal, defeating Facundo Bagnis of Argentina in the bronze-medal match, 6–4, 7–5.