St Leonard's Hill was a large mansion near Clewer in Berkshire.

The house, originally known as Forest Court, was built by Thomas Sandby for Countess Waldegrave in the 1760s.^[1] She named it Gloucester Lodge following her marriage to the Duke of Gloucester in 1766.^[2]

The house was bought by William Harcourt, 3rd Earl Harcourt in 1781 and, after remaining in the Harcourt family for over a century, it was acquired by Sir Francis Barry, 1st Baronet in 1872.^[1] Barry made substantial alterations in the Châteauesque style and renamed it St Leonard's Hill.^[3] Following the death of Lady Barry in 1924 the house was largely demolished.^[3]