Line 3 of the Harbin Metro (Chinese: 哈尔滨地铁三号线; pinyin: Hārbīn Dìtiě Sān Hào Xiàn) is a rapid transit ring line in Harbin.

The first phase of the line, from Harbin West Railway Station to The Second Affiliated Hospital of Harbin Medical University, commenced operations on 26 January 2017.

The section from The Second Affiliated Hospital of Harbin Medical University to Taipingqiao, and the section from Harbin West Railway Station to Sports Park opened on November 26, 2021.

[2][5] The remaining section, comprising 9 stations, opened on 25 November 2024.

[6] - Stations in operation - Under construction, opening in 2023 & 2024 Services on the line are provided by six-car Type B trains, which have a total capacity of 1440.