The men's welterweight competition of the boxing events at the 2011 Pan American Games in Guadalajara, Mexico, was held between October 21 and 28 at the Expo Guadalajara Arena.

[1] The defending champion was Karl Dargan from the United States.

Welterweights were limited to those boxers weighing less than or equal to 69 kilograms.

Like all Pan American boxing events, the competition was a straight single-elimination tournament.

Both semifinal losers were awarded bronze medals, so no boxers competed again after their first loss.