John Alsop King (January 3, 1788 – July 7, 1867) was an American politician who was the twenty-second governor of New York from 1857 to 1858.

His maternal grandparents were John Alsop (1724–1794), a prominent merchant and Mary Frogat (1744–1772).

Upon graduating from Harrow, King returned to New York City to study law.

[6] John King's law career was interrupted by a stint in the military; he served as a cavalry lieutenant in the War of 1812.

His term as Governor of New York from 1857 to 1858 was noted for improvements to the State's education system and the enlargement of the Erie Canal.