Nicholas "Nick" Dozenberg (1882–1954) was an American political functionary with the Communist Party USA in the 1920s.
Late in 1927 Dozenberg was recruited into the underground Soviet military intelligence network, for which he worked for more than a decade under the pseudonym "Nicholas Ludwig Dallant." Apprehended by the Federal Bureau of Investigation in December 1939, Dozenberg cooperated with the investigation fully, giving oral or written testimony before the House Committee on Un-American Activities (HUAC) on three separate occasions.
Never charged for espionage, Dozenberg pleaded guilty to a charge of passport fraud in 1940 and received a comparatively light jail term of one year and one day.
He lived a quiet and private life following his release from prison in 1941.