Les Aspin, American captain and politician, 18th United States Secretary of Defense (b. 1938)
Leslie Aspin Jr. (July 21, 1938 – May 21, 1995) was an American politician who served as the U.S. representative for Wisconsin's 1st congressional district from 1971 to 1993 and as the 18th United States Secretary of Defense under President Bill Clinton from 1993 to 1994.

In Congress, Aspin had a reputation as an intellectual who took a middle-of-the-road position on controversial issues. He supported the Reagan administration regarding the MX missile and aid to the Nicaraguan Contras, but he opposed the B-2 bomber and the Strategic Defense Initiative. He played a major role in convincing the House to support the January 1991 resolution supporting the use of force by President George H. W. Bush against Iraq, after it invaded Kuwait.

Aspin served as Secretary of Defense from 1993 to 1994. He faced complex social issues, such as the roles of homosexuals in uniform, and of women in combat, as well as major decisions regarding the use of military force in Somalia, Bosnia, and Haiti. He proposed budget cuts and restructuring of forces as part of the downsizing of the military after the end of the Cold War. The deaths of U.S. soldiers in Somalia because of inadequate military support led to his resignation.