The Chamak-class missile boats (NATO code: Osa II class) of the Indian Navy were an Indian variant of the Soviet Project 205 Moskit.

The Osa-II Class missile boats formed the 25th Missile Vessel (K25) Squadron, also known as the Killers, based at Vizag. Osa is the Russian word for Wasp. All eight missile boats have been decommissioned from service.

Ships of the class NamePennant CommissionedDecommissionedFateNotes K90 17 February 1976 29 December 1999 K91 17 February 1976 8 June 2001 K92 17 February 1976 17 May 1996 K93 17 February 1976 29 December 1999 Preserved at EsselWorld, Gorai, MaharashtraFree Entry to visitors of the amusement park K94 4 November 1976 5 May 2005 Preserved at Karwar, Karnataka K95 4 November 1976 5 May 2005 Preserved at NDA, Khadkavasla K96 9 February 1977 5 May 2005 Preserved at SNC HQ, Kochi. The propeller has been gifted to Department of Ship Technology, CUSAT. K97 17 October 1977 17 May 1996

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