President

President was the title given to the heads of state, usually of a republic, or the figure who presided over a governmental or corporate body. There were presidents on many worlds, including Gallifrey, Earth, Androzani Major, Fangoria and Theros. (TV: The Deadly Assassin, The Sound of Drums, The Caves of Androzani; PROSE: Warmonger; COMIC: The Therovian Quest)

On Gallifrey, the Lord President of the Time Lords was the head of Gallifreyan society. (TV: The Deadly Assassin) Androzani Major was similar, having a single president as the planet's lead official. (TV: The Caves of Androzani)

On Earth, the United States of America was governed by a president. (TV: The Chase)

Throughout its existence during the American Civil War from 1861 to 1865, the Confederate States of America was likewise governed by a president. The only person to ever hold the office was Jefferson Davis. (PROSE: Blood and Hope)

France had presidents. Napoleon III was elected President of France in 1848 and served in the office until 1852, when he declared himself Emperor of the Second French Empire. (PROSE: World Game)

In Pete's World, Great Britain had a president. (TV: Rise of the Cybermen) By the 26th century, the whole of Earth had a president. (TV: Frontier in Space, AUDIO: Terror)

In a parallel universe visited by the Third Doctor, the American Confederation was led by a president. (PROSE: The Face of the Enemy)

During a crisis of "frozen" planes in mid-air, UNIT head Kate Stewart got a call from the President, possibly the American one, but had to call him back later. (TV: The Magician's Apprentice)

By 2014, UNIT had created a regulation whereby the Doctor would be officially appointed as the President of Earth in the times of extreme crisis as the only person everyone would trust with the defence of Earth. Such crises included the Cybermen converting the dead, the apparent breakdown of the UNIT/Zygon peace treaty, and the mysterious appearance of the Monks' pyramid. (TV: Death in Heaven, The Zygon Inversion, The Pyramid at the End of the World)

The Tenth Doctor once pretended to get a phone call from the President of Algeria, who he believed he might have met once. (COMIC: Revolutions of Terror)

In 2017, Ramirez Harmon was the President of Mexico. (AUDIO: Army of Death)

Ram Vendal was the Tibari president. (AUDIO: Fear of the Daleks)

Wilson K. Wilson was President of the New Earth System in the 25th century. (COMIC: Doctor Who and the Dogs of Doom)

Lithops was the President of Mars in the 27th century. (COMIC: Bus Stop!)