The second volume of a series on a glossary of codebreaking, WW2 Codebreaking Events and Organisations, brings to the reader an easily understandable account and listing, of those organisations involved in collecting and analysing military intelligence principally during the second world war. A listing of key events or occurrences is provided which moulded the direction of codebreaking and gathering of enemy intelligence. Whilst Bletchley Park was the HQ of codebreaking activities in wartime, numerous organisations became involved in a support role, and this became critical when more advanced enemy encoding machines were introduced by the Nazis. The evolution of certain organisations over time, can be tracked to a degree, by reading the glossary in depth. The entries are cross-referenced to enable the reader to research as much or as little as they want, to dip-in to the glossary, to use it as a basis for further study, or just to learn a little more about the people and organisations that helped us win the war with our allied friends. AUTHOR: Ronald Koorm is a published author in codebreaking and a lecturer in related subjects of military intelligence. He researched codebreaking satellite stations which supported Bletchley Park and had a book published in 2020, (Backing Bletchley-The Codebreaking Outstations from Eastcote to GCHQ), largely on Outstation Eastcote, one of several codebreaking outstations. The research carried out then, together with subsequent research after publication, has enabled the author to facilitate writing the Glossary in a series of books. As a retired Chartered Building Surveyor, Ron Koorm has written technical publications on other subjects and writes articles, blogs and lectures on a wide range of topics including military history, and inclusive design. In 2019 he gave a talk on the 75th anniversary of D-Day at the Battle of Britain Bunker Museum at Uxbridge, on codebreaking and how it influenced D-Day. He has also lectured at Bentley Priory Museum, Headstone Manor Museum, and Universities on military history, including Support systems to intelligence operations, and Fake News-Or how to deceive the enemy during WW2. The author has been in contact with several Ex-Wrens who operated codebreaking machines at outstations during WW2. 20 b/w illustrations