Espionage, Counterintelligence, and Naval Observation in the Middle of the Atlantic: A Case Study of US Intelligence in the Canary Islands (1939–1945).

This article examines the role of United States intelligence operations in the Spanish Canary Islands from 1939 to 1945 as a strategic component of Allied efforts in the North Atlantic during the Second World War. US intelligence activities, conducted under diplomatic cover through consulates and agencies such as the Office of Naval Intelligence (ONI) and the Office of Strategic Services (OSS), focused on monitoring German naval movements, controlling oil supplies, countering espionage, and gathering operational information linked to North Africa. Key figures included OSS agent Thomas Alfree Weir, who operated under the cover of Oil Observer and Vice-Consul in Tenerife, coordinating intelligence and counterintelligence efforts. Despite Spain's official neutrality and German attempts to use the islands for naval supply and intelligence, US and British cooperation limited Axis influence, facilitated Allied surveillance, and laid groundwork for postwar strategic interests in the archipelago.