The Class C55 (C55形) is a type of 4-6-2 steam locomotive built in Japan from 1935 to 1937.

A total of 62 Class C55 locomotives were built and designed by Hideo Shima.

Production of the Class C54, originally intended for this role, was discontinued in 1931 after just 17 locomotives due to various design flaws.

The C55's design incorporated many lessons learned from the C54's shortcomings, particularly in the structure of the main frame.

Twenty C55 locomotives were built with a streamlined design, and they were the last Japanese locomotives to be equipped with driving wheels with spokes.