Henry Augustus Dillon-Lee, 13th Viscount Dillon (28 October 1777 – 24 July 1832) was an Irish peer, writer and MP for Harwich and for County Mayo.
Henry Augustus was born on 28 October 1777 at Brussels, the son of Charles Dillon-Lee, the twelfth Viscount Dillon, and his wife Henrietta Maria, the only daughter of Constantine John Phipps, 1st Baron Mulgrave. In the year 1794, when he was seventeen years old, Henry Augustus was a Colonel of the Irish Brigade. In 1799, at age 22, he was a Member of Parliament for County Harwich, and in 1802 became a Knight for Mayo. His knighthood ended in 1813 upon the death of his father, when he acceded to the Peerage as the thirteenth Viscount Dillon of Costello-Gallen.
In February 1807, Henry Augustus Dillon-Lee married Henrietta Browne, sister of Dominick, 1st Baron Oranmore and Browne, daughter of Dominick-Geoffrey Browne, by Margaret, daughter of the Hon. George Browne, 4th son of the 1st Earl of Altamont.
The marriage produced nine children:
Emily W. Sunstein in her biography Mary Shelley: Romance and Reality writes "the literary Lord Dillon... was said to be Eliza Rennie's lover."
He died 24 July 1832. His widow died thirty years later at the Hotel Windsor, Paris, 18 March 1862, aged 73.