K-6 is an intercontinental submarine-launched ballistic missile under development by Defence Research and Development Organisation of India. The missile has a planned range of around 10,000 to 12,000 kilometres.^[1]

Admiral Arun Prakash wrote in 2018 that the missile range of the Arihant-class submarines is not sufficient to target potential adversaries of India; a missile with a range of around 6,000-8,000 kilometres^[2] would be required for this task to be performed by a submarine patrolling in a "safe haven".^[3]

When the missile payload limitations of the Arihant-class were realised, India began developing the S5-class of submarines and the K-6 ballistic missiles.^[1] The developmental work for these missiles started in February 2017 at the Advanced Naval Systems Laboratory of DRDO, with a completion target of less than ten years.^[1]

The K-6 is an intercontinental submarine-launched ballistic missile.^[4][5] It is a three-stage missile and is solid fuelled. It is planned to armed with multiple independently targetable reentry vehicles and will have a range of around 8,000 to 12,000 kilometres with a three-tonne payload. It has a planned length of over 12 metres and a diameter of over 2 metres.^[1]

The K-6 is being developed by the Advanced Naval Systems Laboratory of the Defence Research and Development Organisation since 2017.^[1] Testing of the K-5 missile will assist in developing the K-6.^[6]

• K Missile family
• S5-class submarine
• India and weapons of mass destruction