The men's 58 kg competition at the 2012 Summer Olympics was held on 8 August, at the ExCeL Exhibition Centre.

The main bracket consisted of a single elimination tournament, culminating in the gold medal match.

Every competitor who lost to one of the two finalists competed in the repechage, another single-elimination competition.

Each semifinal loser faced the last remaining repechage competitor from the opposite half of the bracket in a bronze medal match.

Each semifinal loser faced the last remaining repechage competitor from the opposite half of the bracket in a bronze medal match.