| Event: | Men's Welterweight |
| Games: | 2019 |
| Venue: | Miguel Grau Coliseum |
| Dates: | July 28– August 1, 2019 |
| Competitors: | 8 |
| Nations: | 8 |
| Gold: | Roniel Iglesias |
| Goldnoc: | CUB |
| Silver: | Rohan Polanco |
| Silvernoc: | DOM |
| Bronze: | Delante Johnson |
| Bronzenoc: | USA |
| Bronze2: | Gabriel Maestre |
| Bronzenoc2: | VEN |
| Prev: | 2015 |
| Next: | 2023 |
The Men's welterweight competition of the boxing events at the 2019 Pan American Games in Lima, Peru, was held between the 28 of July and the 1 of August 2019 at the Miguel Grau Coliseum.
Like all Pan American boxing events, the competition is a straight single-elimination tournament. Both semifinal losers are awarded bronze medals, so no boxers compete again after their first loss. Bouts consist of a 3 rounds "10-point must" scoring system used in the pro game, where the winner of each round must be awarded 10 points and the loser a lesser amount, and the elimination of the padded headgear. Five judges scored each bout. The winner will be the boxer who scored the most at the end of the match.