Kitty Harris (Unknown – 1966) was a Soviet secret agent and "long-time special courier of the OGPU-NKVD foreign intelligence during the 1930s and 1940s." Harris was identified only in 2001 when her code name "Ada" or "Aida" was found in declassified files from the Venona Project. This was a counterintelligence program initiated by the United States Army's Signal Intelligence Service (later the National Security Agency) that ran from February 1, 1943 until October 1, 1980.