President
President was a title sometimes given to heads of state, or someone who presided over a governmental or corporate body.

General Santa Anna was the President of Mexico in 1836. ()

The board of trustees of the Starfleet Academy was headed by a president in the 2150s. ()

Altair VI elected a new planetary president in 2267. The , along with two other Federation starships, was scheduled to attend the president's inauguration. The Enterprise, however, diverted to  when Spock entered pon farr. ()

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." ()

Salutation 
"Mr. President" was a formal salutation used when addressing the president of a government.

James T. Kirk referred to an Excalbian who appeared as a former President of the United States, Abraham Lincoln, as "Mr. President". ()

Both a Human Federation president and an Efrosian Federation president were referred to as "Mr. President", as well as President Jaresh-Inyo. (; ; )

When The Doctor portrayed the President of Earth in order to conduct negotiations with a photonic lifeform, Harry Kim addressed him as "Mr. President" upon his return. ()

Examples 
 President of Earth
 President of Ni'Var
 President of the United Federation of Planets
 President of the United States

See also
 President of the Court

External links
 
 
 

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Titles
Occupations
Government