Otto Ernest Passman (born June 27, 1900) was a Democratic member of the United States House of Representatives from Louisiana. He represented Louisiana’s 5th congressional district and served as a federal legislator for three decades in the mid-twentieth century. His long tenure in Congress marked him as a significant political figure for his district and state during a period of substantial national and international change.

Passman began his service in the U.S. House of Representatives on January 3, 1947. Over the course of 15 consecutive terms, he continued to represent Louisiana’s 5th district, maintaining his seat through repeated reelections. His congressional career concluded on January 3, 1977, at which point he left office as a former representative after thirty years in the House. Throughout this period, he served as a Democratic representative, contributing to the legislative work of Congress on behalf of his Louisiana constituents.