Tianzhou 3 (Chinese: 天舟三号) was a mission of the Tianzhou-class uncrewed cargo spacecraft, launched on 20 September 2021, at 07:10:11 UTC.

Tianzhou 3 was the second cargo resupply mission to the Tianhe core module (TCM) of the under-construction Tiangong space station, carrying over six tons of supplies.

The spacecraft successfully docked at the TCM's aft port seven hours after launch at 14:08 UTC.

[3] On 17 July it was undocked for deorbiting, making way for the installation of the Wentian module.

[4] The Tianzhou cargo ship has several notable differences with the Tiangong stations from which it is derived.