Family
In 1821 he married Lady Emily Jane, seventh daughter of Robert Stewart, 1st Marquess of Londonderry. They had two sons, and two daughters:
Charles Stewart Hardinge, 2nd Viscount Hardinge of Lahore and Kings Newton (2 Sep 1822 – 28 July 1894)
Arthur Edward Hardinge (2 Mar 1828 – 15 July 1892) married Mary Georgina Frances Ellis, daughter of Lt.-Col. Hon. Augustus Frederick Ellis. They had two sons, and three daughters, one of whom being Arthur Henry Hardinge.
Hon. Frances Elizabeth Hardinge (d. 9 July 1894) married Gen. Sir Arthur Cunynghame, son of Sir David Cunynghame, 5th Baronet. They had two sons, and three daughters.
Hon. Emily Caroline Hardinge (d. 4 Sep 1876). Unmarried, a lady-in-waiting to Princess Alice of the United Kingdom.
His elder son, Charles Stewart, who had been his private secretary in India, was the 2nd Viscount Hardinge. The younger son of the 2nd Viscount, Charles Hardinge (b. 1858), became a prominent diplomat, and was appointed Viceroy of India in 1910, being created Baron Hardinge of Penshurst.
His stepson was Walter James, 1st Baron Northbourne, (1816–1893).
