KRI Hiu (634) is a FPB-57 Nav V patrol boat currently operated by the Indonesian Navy.
Singa was built by Lürrsen-Werft, fitted out by PT PAL and launched in 2000. The ship was commissioned in 2000.
On 22 April 2021, she was deployed off Bali in search for , which went missing off the waters of Bali during a torpedo drill. The navy had deployed six additional ships to the area which were , , , , KRI Hiu and .