Alexander Vassiliev (born May 1, 1962) is a Russian-born journalist and author known for his research on Soviet intelligence history. He worked for Soviet and Russian media before moving to the United States. Vassiliev gained prominence for co-authoring 'The Haunted Wood: Soviet Espionage in America—The Stalin Era,' based on declassified Venona files. His work has sparked debates on historical interpretation and intelligence studies.