Sagarika (pronounced: sɑːgərikɑː) (lit. 'Oceanic'), also known by the code names K-15 or B-05 or PJ-08, is an Indian submarine-launched ballistic missile (SLBM) with a range of 750 kilometres (466 mi) that was designed for retaliatory nuclear strikes. It belongs to the K Missile family and forms a part of India's nuclear triad.

The K-15 is a two-stage submarine-launched ballistic missile which uses a gas booster to eject out of its launch platform and rise up to the surface of water. A solid rocket motor is fired after the missile reaches a fixed altitude. The missile has a range of around 750 kilometres (466 mi).

Development of the K-15 missile started in the late 1990s with the goal of building a submarine-launched ballistic missile for use with the Indian Navy's nuclear-powered Arihant-class submarines. It was developed at the Defence Research and Development Organisation’s (DRDO) missile complex in Hyderabad.

The development of the underwater missile launcher, known as Project 420, was completed in 2001 and handed over to the Indian Navy for trials. The missile launcher is developed at Hazira in Gujarat. The Sagarika missile began integration with India's nuclear-powered Arihant-class submarine that began harbour trials on 26 July 2009.

The missile was fully operationalised in August 2018.