The Malabar naval exercise is an annual, multilateral maritime drill involving the navies of India, the United States, Japan, and Australia, conducted in the Indo-Pacific region. It originated in 1992 as a bilateral exercise between the Indian Navy and the United States Navy along the Malabar Coast of southwestern India. The exercise was created in the wake of the Cold War to foster strategic reorientation and cooperation between the two nations. It was suspended after India's 1998 Pokhran-II nuclear tests and resumed in 2002.
The exercise is structured to enhance interoperability—the capacity of distinct navies to communicate and operate as a coherent force—and is typically conducted in two phases: a harbour phase for professional exchanges and planning, and a sea phase for advanced operations. The sea phase includes high-tempo drills such as anti-submarine warfare (ASW), anti-air and anti-surface gunnery, maritime interdiction operations, and complex carrier-strike-group manoeuvres. Participating assets routinely include aircraft carriers, submarines, destroyers, frigates, and maritime patrol aircraft like the P-8 Poseidon.
The exercise has significantly changed in its composition and scope, evolving from a bilateral to a quadrilateral format. The Japan Maritime Self-Defense Force became a permanent participant in 2015, making it a trilateral exercise. Most recently, Australia rejoined permanently in 2020, completing the alignment of the exercise's membership with the Quadrilateral Security Dialogue (Quad), a strategic forum focused on a free and open Indo-Pacific. The exercise location rotates, demonstrating the combined ability to operate across the entire Western Pacific and Indian Oceans. The core aim remains operational coordination and readiness to maintain an open maritime order.