H. L. Callahan (born September 11, 1932) is a former American politician who represented the state of Alabama in the United States House of Representatives. A member of the Republican Party, he served as the U.S. Representative for Alabama’s 1st Congressional District. His tenure in Congress began on January 3, 1985, and concluded on January 3, 2003, spanning nine consecutive terms in the House.

During his eighteen years in office, Representative Callahan was part of the Republican delegation from Alabama at a time of significant political and regional realignment in the South. As a historical member of Congress, his service from 1985 to 2003 places him among the long-serving representatives of his state’s 1st District. While specific committee assignments, legislative initiatives, and post-congressional activities are not detailed in the available record, his extended tenure indicates sustained electoral support within his district and a stable role in Alabama’s federal representation.