United States national amateur boxing flyweight champions

Below is a list of United States national Amateur Boxing Flyweight Champions, also known as United States Amateur Champions, along with the state or region which they represented. The weight class was contested at 105 pounds between 1888 and 1912. It was contested at 108 pounds between 1913 and 1921, before moving to 112 pounds in 1922, where it is contested at currently. The United States National Boxing Championships bestow the title of United States Amateur Champion on amateur boxers for winning the annual national amateur boxing tournament organized by USA Boxing, the national governing body for Olympic boxing and is the United States' member organization of the International Amateur Boxing Association (AIBA). It is one of four premier amateur boxing tournaments, the others being the National Golden Gloves Tournament, which crowns its own amateur flyweight champion, the Police Athletic League Tournament, and the United States Armed Forces Tournament, all sending champions to the US Olympic Trials.