Line 23 is an under construction Shanghai Metro line that would run from Shanghai Indoor Stadium in Xuhui District to Minhang Development Zone in Minhang District.

The line was announced by the Shanghai municipal government in 2016.

The line will not utilise the existing branch Line 5 service between Dongchuan Road and Minhang Development Zone stations, with the line planned to be fully underground.

[3] Once complete, it will feature interchange stations with Lines 3, 4, 5, 15, and 19.

[4] The construction period of this project is expected to be 74 months.