Line 5 of the Tianjin Metro () is a rapid transit line running semi-circular from north-west to south-west Tianjin. It is run by Tianjin Binhai Mass Transit Development Co., Ltd, which becomes a subsidiary of Tianjin Rail Transit Group Corporation since 2017.
The line is 36.1 km in length and has 29 stations. Beichenkejiyuanbei is half-underground. Liqizhuangnan is at-grade. All other stations are underground. The line uses 6 car B size trains. Line 5, together with Line 6 forms a loop around Tianjin.
On 22 October 2018, the section from Danhebeidao to Zhongyiyifuyuan (26 stations) became operational. On 31 January 2019, the line was extended one station to Beichenkejiyuanbei. On 7 December 2021, the line was extended one station to Liqizhuangnan.