KRI Prabu Siliwangi (321) is a Thaon di Revel-class offshore patrol vessels to be operated by the Indonesian Navy.

The vessel was originally constructed as Ruggiero di Lauria (P435), the sixth ship of the class built for the Italian Navy.

The construction was started with the first steel cutting ceremony on 7 April 2021 at Fincantieri Muggiano.

[2] Ruggiero di Lauria is one of the two Thaon di Revel-class vessels sold to the Indonesian Navy in a 1.18 billion Euro contract, which was signed on 28 March 2024.

[4] The ship was renamed as KRI Prabu Siliwangi (321) on 29 January 2025 at a ceremony in Muggiano shipyard.