William Ball Sutch (27 June 1907 – 28 September 1975) was a New Zealand economist, historian, writer, public servant, public intellectual.
He was suspected of being a Soviet spy and in 1974, he was charged with trying to pass New Zealand Government information to the Soviet Union.
He was acquitted, an outcome that was the subject of much debate since then.
Although there were subsequent disclosures from the KGB which indicated that he may have been a spy, no definitive proof that he was has ever been uncovered.