The heavyweight was one of five boxing weight classes contested on the boxing at the 1908 Summer Olympics programme. Like all other boxing events, it was open only to men. The boxing competitions were all held on October 27. The heavyweight was the middle class, allowing boxers of any weight. Six boxers all from Great Britain competed. Each NOC could enter up to 12 boxers. France entered 1 boxer, who withdrew; Great Britain entered 7 boxers, 1 of whom withdrew, and the Netherlands entered 1 boxer, who withdrew.