Vernon Eugene Clark is a retired admiral who served as the Chief of Naval Operations (CNO) of the United States Navy. He retired on July 22, 2005, making his tenure of five years the second-longest serving CNO behind Arleigh Burke. He currently sits on the board of directors of Raytheon and SRI International. In November 2009, he was selected along with former Secretary of Veterans Affairs Togo West by Defense Secretary Robert Gates to lead the military investigation into the Fort Hood massacre.

The chief of naval operations (CNO) is the highest-ranking officer of the United States Navy. The position is a statutory office held by an admiral who is a military adviser and deputy to the secretary of the Navy. The CNO is also a member of the Joint Chiefs of Staff and in this capacity, a military adviser to the National Security Council, the Homeland Security Council, the secretary of defense, and the president.