Admiral of the Navy. However, there is no one currently serving at that rank in today's armed forces. Admiral of the Navy was a wartime rank last used in WWII.
The current 'Highest Ranking Officer' in the Navy is the Chief of Naval Operations (CNO) with the rank of Admiral.
In politics in the United States, the highest ranking job title would be President of the United States. For most businesses the top title is President and Chief Executive Officer.
Vice Chief of Staff.
The highest-ranking officer in the Canadian Forces is Walter Natyncyk, a General with the formal title of "Chief of Defence Staff" (CDS).
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The President is the Commander in Chief. Highest Rank of the Military.
The president.
Not necessarily.
The highest ranking officer in the Army is the Army Chief of Staff. The current Army Chief of Staff is General Martin Dempsey.
Lightoller was the second officer on board the Titanic. He was the highest ranking officer to survive the disaster.
The US Attorney General is the highest ranking officer of the US Department of Justice, aside from the President of the US.
The Army Chief of Staff is the highest ranking officer in the peacetime Army. The highest raning NCO is the Sergeant Major of the Army.
In most structured armies it is the rank of 'Field Marshal'.