Horatio Walpole, 4th Earl of Orford (September 24, 1717 – March 2, 1797)— also known as Horace Walpole—is an English art historian, man of letters, antiquarian and Whig politician.

He has Strawberry Hill House built in Twickenham, south-west London, reviving the Gothic style some decades before his Victorian successors.

His literary reputation rests on his Gothic novel, The Castle of Otranto (1764) and his Letters, which are of significant social and political interest.

He is the son of the first British Prime Minister Sir Robert Walpole.

As Horace Walpole is childless, on his death his barony descends to his cousin of the same surname, who is created the new Earl of Orford.