The 1920 Olympic boxing matches were conducted in the Auditorium at the Zoological Gardens in Antwerp. This was the first Olympic boxing tournament since 1908, as boxing was not contested in Sweden in 1912, when the Games were held in Stockholm. Matches at Antwerp were contested over three rounds, the first two lasting three minutes each and the last round of four minutes. Extra rounds, if they were necessary to decide draws, consisted of two minutes each. Two judges and a referee judged each match. All judges were European and more than half of them were Belgian. There were two sessions held each of the four days of the boxing tournament (21-24 August 1920). The afternoon session was held from 1400-1800, while the evening sessions lasted from 2000-2300.

There were a few controversies in 1920 Olympic boxing, but nothing approaching that of later Olympics. Two of the decisions upset the Americans a great deal, but Belgian sources seem to indicate that they were scoring and reporting errors, not actual judging errors.

The flyweight division was won by Frankie Genaro, who was born Frank DiGennara. Shortly after the Olympics he turned professional and became world professional flyweight champion for several years. In the finals he won by a unanimous decision over Anders Pedersen of Denmark.

The men's flyweight event was part of the boxing programme at the 1920 Summer Olympics. The weight class was the lightest contested, and allowed boxers of up to 112 pounds (50.8 kilograms). The competition was held from August 21, 1920 to August 24, 1920. 16 boxers from nine nations competed

South Africa’s Clarence Walker won four decisions to win the gold medal in this event. The 1919 Inter-Allied Champion had been Albert Evans of Australia, who had defeated Enea Marzzorati of Italy, but neither competed at Antwerp.

The men's bantamweight event was part of the boxing programme at the 1920 Summer Olympics. The weight class was the second-lightest contested, and allowed boxers of up to 118 pounds (53.5 kilograms). The competition was held from August 21, 1920 to August 24, 1920. Twelve boxers from seven nations competed

Paul Fritsch had his most difficult time in the first round when he faced George Etzell of the United States. In a close bout, the two judges gave the decision to Fritsch while the referee (Sykes of Great Britain) favored Etzell. The decision was at first announced for Etzell, as the referee raised the hand of the boxer he had voted for. But Pierre Makar of Belgium, one of the judges, quickly reversed the decision, stating, correctly, that he and the other judge had selected Fritsch as the victor. The Americans were irate, thinking the decision had been reversed when, in fact, it had only been announced incorrectly. In the next two rounds, Fritsch had an easy time of it, winning his quarter-final and semi-final matches by knock-outs. In the final he faced Jean Gachet of France and won an easy decision. The men's featherweight event was part of the boxing programme at the 1920 Summer Olympics. The weight class was the third-lightest contested, and allowed boxers of up to 126 pounds (57.2 kilograms). The competition was held from August 21, 1920 to August 24, 1920. 17 boxers from ten nations competed

Samuel Mosberg survived a scare in the quarter-finals when he had to go an extra round to defeat Frederick Grace of Great Britain. Grace was, incredibly, the defending champion, although it had been twelve years since he had won the lightweight gold medal in London. In 1920, Grace was 36-years-old, giving 12 years to the younger Mosberg. After defeating Grace, Mosberg scored one of the fastest KO’s in Olympic history when he finished South Africa’s Richard Beland in 15 seconds. The final was close, but Mosberg was awarded the decision. Going to Antwerp, the top American was thought to be Frank Cassidy, who had been AAU Champion in 1919, but Cassidy was decisioned by Denmark’s Gotfred Johansen in the quarter-finals.

The men's lightweight event was part of the boxing programme at the 1920 Summer Olympics. The weight class was the fourth-lightest contested, and allowed boxers of up to 135.5 pounds (61.2 kilograms). The competition was held from August 21, 1920 to August 24, 1920. 16 boxers from ten nations competed

Albert “Bert” Schneider was a very unlikely champion. He was born in Cleveland as an American but moved to Montreal as an infant. In 1920 he won the Canadian amateur welterweight championship. He was selected for the Canadian team shortly after that, although he did not have Canadian citizenship. Rules for national representation at the Olympic Games were much looser in 1920. In the semi-finals, Schneider fought another American, Frederick Colberg, and defeated him easily. The finals were closer, and Schneider needed an extra round to win a decision over Alexander Ireland. After the Olympics, Schneider turned professional and fought about 75 fights, with only marginal success.

The men's welterweight event was part of the boxing programme at the 1920 Summer Olympics. The weight class was the fourth-heaviest contested, and allowed boxers of up to 147 pounds (66.7 kilograms). The competition was held from August 21, 1920 to August 24, 1920. 18 boxers from ten nations competed.

Harry Mallin ran through the North Americans to win his gold medal, defeating Americans in the first two rounds and Canadians in the semi-final and final. In the second round against Samuel Lagonia, Lagonia was disqualified for clinching in the second round. The U.S. report stated that the decision was grossly unfair and that it was Mallin who should have been disqualified. However, the Belgian newspapers stated that Mallin was well ahead at the time of the disqualification and that Lagonia was stalling a great deal. Mallin is considered the greatest amateur boxer ever from England. He was apparently never beaten in the ring. In 1924, he returned to the Olympics and became the first boxer to defend an Olympic championship. Lagonia was U.S. AAU Champion from 1919-1921. The 1919 Inter-Allied Champion in this class competed at Antwerp, but Eddie Eagan moved up to the light-heavyweight class.

The men's middleweight event was part of the boxing programme at the 1920 Summer Olympics. The weight class was the third-heaviest contested, and allowed boxers of up to 160 pounds (72.6 kilograms). The competition was held from August 21, 1920 to August 24, 1920. 17 boxers from nine nations competed

Although more excitement often accompanies the bigger weight classes, every match in the light-heavyweight division was decided by a decision. The winner was Eddie Eagan, who would later become a Rhodes Scholar and would also win a gold medal in bobsledding in the 1932 Olympic Winter Games. Through 2004, he remains the only athlete to have won gold medals in both the winter and summer Olympics. Eagan had been AAU Heavyweight Champion in 1919 and also won a title at the 1919 Inter-Allied Games, though strangely, in the middleweight class. Bronze medalist Harold Franks holds the distinction of being the only man to ever last three rounds against the 1920 heavyweight champion, Ronald Rawson.

The men's light heavyweight event was part of the boxing programme at the 1920 Summer Olympics. The weight class was the second-heaviest contested, and allowed boxers of up to 175 pounds (79.4 kilograms). The competition was held from August 21, 1920 to August 24, 1920. 11 boxers from six nations competed

Ronald Rawson was probably the most dominating boxer of the 1920 Olympics. None of his three opponents finished their matches with him. His first two matches were stopped in the third and first rounds, respectively, while in the finals he defeated Søren Petersen by a knock-out in the 2nd round. Rawson retired after winning the 1921 Amateur Boxing Association (Britain) Championship. His career record was 28 wins with no losses, and 27 wins by knock-out. Petersen later became a respected Danish professional boxer. In 1924 he was still an amateur and again won the silver medal in the heavyweight division.

The men's heavyweight event was part of the boxing programme at the 1920 Summer Olympics. The weight class was the heaviest contested, allowing boxers weighing over 175 pounds (79.4 kilograms). The competition was held from August 21, 1920 to August 24, 1920. Nine boxers from eight nations competed