 INS Kursura (S20) was a Kalvari-class diesel-electric submarine of the Indian Navy. She was India's fourth submarine. Kursura was commissioned on 18 December 1969 and was decommissioned on 27 February 2001 after 31 years of service. She participated in the Indo-Pakistani War of 1971, where she played a key role in patrol missions. She later participated in naval exercises with other nations and made many goodwill visits to other countries.
