The Orkan class or projekt 660 (NATO code: Sassnitz class) is series of three fast attack craft of the Polish Navy, in service since 1992.

The original project was prepared by the German Democratic Republic for its navy and was named Project 660, it also received the NATO reporting name "Sassnitz".

After the Unification of Germany the unfinished hulls were bought by the Polish Navy from VEB Peenewerft shipyard in Wolgast and successfully completed by Northern Shipyard in Gdańsk.

In 2006, Ministry of Defence ordered 36 RBS-15 Mk 3 anti-ship missiles to equip the ships.

Piorun and Grom were famous Polish destroyers of the Second World War.