William Amhurst Tyssen-Amherst, 1st Baron Amherst of Hackney DL, JP (25 April 1835 – 16 January 1909) was a British Conservative Member of Parliament and collector of books and works of art.
Born William Amhurst Daniel-Tyssen, he was the eldest son of William George Daniel-Tyssen, High Sheriff of Norfolk in 1843, who was the son of William George Daniel, of Foley House, near Maidstone, Kent, High Sheriff of Kent in 1825, and his wife Amelia Amherst, the daughter of Captain John Amherst and Mary Tyssen, heiress of Foulden Hall, Norfolk. Amherst's mother was Mary, daughter of Andrew Fountaine, of Narford Hall, Norfolk. In 1852, he and his father assumed by Royal licence the surname of Tyssen-Amhurst. However, in 1877 he again changed it, to Tyssen-Amherst, also by Royal licence. Tyssen-Amherst was educated at Eton and Christ Church, Oxford.
In 1880, he was elected to Parliament for West Norfolk, a seat he held until 1885, and then represented South West Norfolk until 1892. The latter year he was raised to the peerage as Baron Amherst of Hackney, in the County of London, with remainder, in default of male issue, to his eldest daughter Mary and her issue male. Apart from his parliamentary career Tyssen-Amherst also served as High Sheriff of Norfolk in 1866 and as Deputy Lieutenant of Middlesex and was a Justice of the Peace for Norfolk, Middlesex and Westminster.