HMAS Stalwart is the second of the Navantia built Supply-class replenishment oiler for the Royal Australian Navy.

It had its keel laid in November 2018[2] as a part of the SEA 1654 Phase 3 project.

[3][4] The two ships are based on the Spanish Cantabria class and were built at the Ferrol shipyard.

[5] As of March 2021, the vessel began sea trials in Spain though work on her was running about eight months behind schedule.

[8][9] In June 2024 Stalwart was brought into Darwin for emergency repairs due to engine trouble.