Stanley Lloyd Greigg (born May 7, 1931) was a Democratic member of the United States House of Representatives from Iowa. He represented Iowa’s 6th Congressional District during the 89th Congress, serving a single term from January 4, 1965, to January 3, 1967. During this period he held the office of U.S. Representative, listed in the historical record as a former member of Congress.

Greigg’s tenure in the House placed him among Iowa’s mid-20th-century Democratic delegation, serving at a time of significant national legislative activity. Although specific committee assignments, legislative initiatives, and later public roles are not provided in the available record, his service from 1965 to 1967 marks his principal documented contribution to federal elected office.