Horatio Walpole, 4th Earl of Orford (24 September 1717 – 2 March 1797) was an English art historian, man of letters, antiquarian and Whig politician. He is now largely remembered for Strawberry Hill, the home he built in Twickenham, south-west London where he revived the Gothic style some decades before his Victorian successors, and for his Gothic novel, The Castle of Otranto. Along with the book, his literary reputation rests on his Letters, which are of significant social and political interest. He was the son of Sir Robert Walpole, and cousin of the 1st Viscount Nelson.

Horatio Walpole ou Horace Walpole (, Londres - ), 4 comte d'Orford, fils de Robert Walpole, est un homme politique écrivain et esthète britannique.

Horace Walpole 4. Earl Orford (ur. 24 września 1717 w Londynie, zm. 2 marca 1797), pisarz angielski, syn Roberta Walpole'a pierwszego premiera Wielkiej Brytanii. Od 1791 roku był hrabią Orford.