Marian Zacharski (born 1951 in Gdynia, Poland; raised in nearby Sopot), is a former Polish intelligence officer, arrested in 1981 and convicted of espionage against the United States.

In June 1981 William Holden Bell, project manager of the Radar Systems Group at Hughes Aircraft in El Segundo, California, and Zacharski, were arraigned on espionage charges.

For the apprehension of Marian Zacharski credit belongs to a Polish diplomat Jerzy Koryciński at the United Nations who blew the whistle, while asking for political asylum in the US.

According to a court affidavit filed by the bureau, he had paid Bell about $110,000 in cash and $60,000 in gold coins, to photograph highly classified documents detailing Hughes Aircraft radar and weapons systems.

According to Kenneth Kaiser, an agency counterintelligence supervisor in Chicago, Poland was particularly active in industrial espionage: "While the Soviet KGB got all the press, Polish intelligence was perhaps superior.