The men's bantamweight boxing competition at the 2012 Olympic Games in London was held from 28 July to 11 August at the ExCeL Exhibition Centre.

Luke Campbell of Great Britain won the gold medal, defeating Ireland's John Joe Nevin in the final.

The competition began with a preliminary round on 28 July, where the number of competitors was reduced to 16, and concluded with a final on 11 August.

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

All bouts comprised three three-minute periods where the boxers received points for every successful punch they could land on their opponent's head or upper body.