Andy Oppenheimer AIExpE MIABTI (born 1953) is a UK-based expert and consultant in counter-terrorism and CBRNE (chemical, biological, radiological, nuclear weapons and explosives).

He then moved to London and worked in popular science and academic publishing for over 20 years before becoming an author and subject matter expert in defence and counterterrorism in 2001.

Oppenheimer has made TV appearances and radio broadcasts as an expert on terrorism and CBRNE and acts as a consultant for films and documentaries, including Mountbatten: Death of a Royal (History Channel, RTE), Gaddafi and the IRA (ITV), The World's Deadliest Arms Race (ITV), Terror Attacks That Shocked Britain (Current TV, Sky), and Spooks (BBC1).

His first book IRA: The Bombs and the Bullets – A History of Deadly Ingenuity (Irish Academic Press, 2008)[3] covers 150 years of strategic, tactical, and operational details, with penetrating analysis of the IRA's mission, doctrine, targeting, and acquisition of weapons and explosives.

Hosting the book as Orion the Hunter, he draws on experience working for Omni (magazine) from 1978 to 1983 with Patrick Moore and from a love of cosmology and Greek mythology.

Oppenheimer also wrote and sang from 2010 to 2015 as Touching the Void with veteran producer Mark Warner (of Rossetti's Compass and formerly of the 1980s band Sudeten Creche) and released an album, Love, Longing and Loss in 2015.

He has played live as Oppenheimer MkII at music festivals in Germany and Poland and continues to perform at clubs in Vienna and London.