Line 3 of the Tianjin Metro (Chinese: 天津地铁三号线; pinyin: Tiānjīn Dìtiě Sān Hào Xiàn) a rapid transit line running from north-east to south-west Tianjin.

It was opened on 1 October 2012.

The line is 33.7 km long and has 26 stations of which 8 are elevated and the rest are underground.

[1] OSI: Out-of-station interchange