Donald Charles Winter is an American technologist and business leader who served as United States Secretary of the Navy. A former top executive of TRW, Aerospace & Defense, he was nominated in 2005 by President George W. Bush, confirmed by the United States Senate, and took the oath of office on January 3, 2006. In January 2009 Defense Secretary Robert Gates requested that Winter remain in office until President Obama picked his successor on March 13, 2009. He resigned on March 13.

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.