Elwood Haynes Hillis (born March 6, 1926) is a former American politician who represented the state of Indiana in the United States House of Representatives. A member of the Republican Party, he served as the U.S. Representative for Indiana’s 5th Congressional District. His tenure in Congress began on January 21, 1971, and concluded on January 3, 1987, spanning eight consecutive terms in the House.

During his sixteen years in office, Hillis served as a Republican representative from Indiana, reflecting the interests of his district at the federal level throughout the 1970s and 1980s. Identified in congressional records by the biographical guide ID H000624, he is recognized as a historical member of Congress whose service marked a sustained period of representation for Indiana’s 5th District.