Stanley Lloyd Greigg (May 7, 1931 – June 13, 2002) was an American politician who served one term as a member of the U.S. House of Representatives from northwestern Iowa. A Democrat, he was elected to fill the vacancy left by the retirement of longtime Republican representative Charles B. Hoeven in 1964, but lost to Republican Wiley Mayne two years later in 1966. Greigg was later one of the victims of the Watergate break-in in 1972.