President was a title sometimes given to heads of state, or someone who presided over a governmental or corporate body.
Altair VI elected a new planetary president in 2267. The USS Enterprise, along with two other Federation starships, was scheduled to attend the president's inauguration. The Enterprise, however, diverted to Vulcan when Spock entered pon farr. (TOS: "Amok Time")
After negotiating Cardassia's annexation into the Dominion in 2373, Dukat effectively became the dictator of the Cardassian Union, though still a servant of the Founders. However, he chose to maintain his rank of gul as opposed to legate because he felt it was more "hands on," and because the titles of emperor, president, first minister, and emissary seemed too "pretentious." (DS9: "Ties of Blood and Water")
"Mr. President" was a formal salutation used when addressing the president of a government.
Both a Human Federation president and an Efrosian Federation president were referred to as "Mr. President", as well as President Jaresh-Inyo. (Star Trek IV: The Voyage Home; Star Trek VI: The Undiscovered Country; DS9: "Homefront", "Paradise Lost")
- President of Earth
- President of Ni'Var
- President of the United Federation of Planets
- President of the United States