INS Sindhuvijay (S62) () is a diesel-electric submarine of the Indian Navy. The submarine was commissioned at Riga in the then Soviet Union.
As reported on 3 September 2025, the submarine is expected to undergo a refit at the Hindustan Shipyard. While the Navy has acquired the Acceptance of Necessity (AoN) from the Defence Acquisition Council of the Ministry of Defence, the contract finalisation is expected to be completed within two or three weeks. Given that all the procedures are completed on schedule, the submarine is expected to begin its refit by the end of the year. The refits will include hull repair, equipment overhauling, upgrading sensors and weaponry, extending the submarine's life as well as enhancing combat readiness of the vessel.