Jane's Defence Weekly

Jane's Defence Weekly is a UK-based defence intelligence publication and the flagship title of Jane's (formally Janes Group), a defence and security information company that traces its origins to Fred T. Jane's 1898 reference guide to naval vessels, Jane's Fighting Ships. Jane's Defence Weekly and its family of associated titles — including Jane's Missiles & Rockets, Jane's Land Warfare Platforms, and Jane's All the World's Aircraft — are considered authoritative open-source references on weapons systems, military equipment, and order of battle worldwide.

In the context of the 2026 Iran conflict, Jane's Defence Weekly was a key source for technical analysis of weapons systems deployed in the conflict, including the S-300 PMU-2 air-defence batteries operated by Iran, the capabilities of Nimitz-class carrier strike groups, and the characteristics of IRGC fast-attack boats. Jane's analysts assessed operational performance claims from both sides with technical rigour that distinguished its reporting from open media coverage.

Jane's is now owned by Solenis (formerly IHS Markit, itself acquired by S&P Global before the Jane's titles were divested). Despite multiple ownership changes, the editorial and analytical standards of Jane's publications have remained highly regarded by defence ministries, arms exporters, and researchers. UK and allied military establishments consider Jane's order-of-battle data a primary open-source reference for planning purposes.