William V. Cowan, often nicknamed Bill Cowan, is a retired USMC lieutenant colonel, a public speaker on matters of national security and terrorism, and a former contributor for the Fox News Channel from 2001 to 2016.

He enlisted in the United States Navy at the age of 17, received an appointment to and graduated from the U.S. Naval Academy in 1966, and was commissioned as a lieutenant the United States Marine Corps. He subsequently spent three and a half years in Vietnam. On his first tour he served as a platoon commander with the 3rd Battalion, 26th Marines, along the DMZ and at the siege of Khe Sanh, and later was in charge of the 3rd Marine Division's Kit Carson Scouts program for five months. From 1969 onwards, he was advisor for the South Vietnam military in the Rung Sat Special Zone for two and a half years.

In April 1983, after having been offered a job at the White House Science Advisor's office, he was approached by the Intelligence Support Activity (ISA) to replace the previous U.S. Marine representative as ISA deputy operations officer. He turned down the White House offer, going instead to ISA where he conducted numerous missions as an ISA operative, including being with the team that hunted down and targeted those responsible for the bombing of the Marine barracks in Beirut, which killed 241 servicemen (220 Marines, 18 Navy personnel and 3 Army personnel). He retired from the Marine Corps after what he perceived as inaction by the Pentagon towards dealing with this incident.

After he retired from the ISA, he worked as legislative assistant to Senator Warren B. Rudman during the hearings of the Iran Contra scandal, and was a key staff member in drafting the legislation which created the U.S. Special Operations Command in Tampa, Florida.

he is known internationally for his expertise in planning and executing difficult and often dangerous counter-terrorism, intelligence, and military special operations. He was also a Fox News Channel contributor from 2001 to 2016, has been a co-host with Ambassador Dick Carlson on the radio and television show Danger Zone, and he has written articles for The Washington Times, The Washington Post, The Daily Caller, Breitbart, The Hill, and has been featured in several television shows apart from the documentary such as 60 Minutes, Larry King Live and others.

He co-wrote Snatching Hillary, A Satirical Novel with Dick Carlson.

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