John Jacob Astor III (June 10, 1822 — February 22, 1890) was a financier, philanthropist, and the eldest son of William Backhouse Astor, Sr. (son of John Jacob Astor and Sarah Todd) and Margaret Rebecca Armstrong (daughter of John Armstrong, Jr. and Alida Livingston). One of his uncles was John Jacob Astor, Jr. (1791—1869). John Jacob III became the wealthiest member of the Astor family in his generation and the founder of the English branch of the Astor family.