- See Commander-in-Chief of the Federation Starfleet for the seniormost officer of the Federation Starfleet.
Commander-in-chief is the title given to the highest ranking official in an organization's authority. In some cases, a military officer who is the supreme commanding officer of an organization will hold this rank, but still answer to political or governmental control. In other cases, a civilian or political authority will be appointed a military organization's commander-in-chief.
The President of the United Federation of Planets is the legal commander-in-chief of the Federation Starfleet. Nonetheless, the title also applies to the senior-most Starfleet flag officer, as Commander-in-Chief of the Federation Starfleet.