William Eldridge Odom (June 23, 1932 – May 30, 2008) was a United States Army lieutenant general who served as Director of the National Security Agency under President Ronald Reagan, which culminated a 31-year career in military intelligence, mainly specializing in matters relating to the Soviet Union.

After his retirement from the military, he became a think tank policy expert and a university professor and became known for his outspoken criticism of the Iraq War and warrantless wiretapping of American citizens.

Although constantly trailed by KGB, he nonetheless managed to smuggle out a large portion of Alexander Solzhenitsyn's archive, including the author's membership card for the Writers' Union and Second World War military citations; Solzhenitsyn subsequently paid tribute to Odom's role in his memoir "Invisible Allies" (1995).

Among the primary issues he focused on were American-Soviet relations, including the SALT nuclear weapons talks, the Soviet invasion of Afghanistan, the Iran hostage crisis, presidential directives on the situation in the Persian Gulf, terrorism and hijackings, and the executive order on telecommunications policy.

Since 2005, he had argued that U.S. interests would be best served by an immediate withdrawal from Iraq, having called the 2003 U.S. invasion the worst strategic blunder in the history of U.S. foreign policy.