INS Shishumar (S44) is the lead vessel of the Shishumar class of diesel-electric submarines of the Indian Navy.

[1] She was commissioned on 22 September 1986 under Commander P M Bhate.

[2] Indian Navy awarded $151mn contract for mid-life upgrade and certification of INS Shishumar, the refit will be carried out by Mazagon Dock, Mumbai with technical cooperation from ThyssenKrupp Marine Systems.

[3][4] The refit is planned to be completed by 2021 with a similar upgrade for another vessel of Shishumar class to follow.

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