君主  (1767年七月11日～1848年二月23日)

開端 終結 在位 1825年 1829年 

　　約翰·昆西·亞當斯（John Quincy Adams，1767年7月11日－1848年2月23日），美國第六任總統（1825年－1829年）。
　　
　　他是第二任總統約翰·亞當斯及第一夫人愛比蓋爾·亞當斯的長子。他是美國歷史上第一位繼其父親之後成為總統的總統，也是唯一一位當選美國衆議院議員的卸任總統。

　　John Quincy Adams (July 11, 1767 – February 23, 1848) was the sixth President of the United States from March 4, 1825 to March 4, 1829. He was also an American diplomat and served in both the Senate and House of Representatives. He was a member of the Federalist, Democratic-Republican, National Republican, and later Anti-Masonic and Whig parties.
　　
　　Adams was the son of the second President John Adams and his wife Abigail Adams, the name "Quincy" having come from Abigail's maternal grandfather, Colonel John Quincy, after whom Quincy, Massachusetts is also named.[pn 1] He was a diplomat, involved in many international negotiations, and helped formulate the Monroe Doctrine as Secretary of State. As president he proposed a program of modernization and educational advancement, but was stymied by Congress. Adams lost his 1828 bid for re-election to Andrew Jackson.
　　
　　Adams was elected a U.S. Representative from Massachusetts after leaving office, the only president ever to do so, serving for the last 17 years of his life. In the House he became a leading opponent of the Slave Power and argued that if a civil war ever broke out the president could abolish slavery by using his war powers, which Abraham Lincoln partially did during the American Civil War in the 1863 Emancipation Proclamation.