The men's Greco-Roman 55 kilograms is a competition featured at the 2021 World Wrestling Championships, and was held in Oslo, Norway on 7 and 8 October.

[1] This Greco-Roman wrestling competition consists of a single-elimination tournament, with a repechage used to determine the winner of two bronze medals.

Each bout consists of a single round within a six-minute limit including two halves of three minutes.

Ken Matsui from Japan won the gold medal after beating Emin Sefershaev from the Russian Wrestling Federation in the final 7–1.

Nugzari Tsurtsumia of Georgia and former world champion Eldaniz Azizli from Azerbaijan shared the bronze medals.