Louisa Anne Beresford, Marchioness of Waterford (née Stuart; 14 April 1818 – 12 May 1891) was a British Pre-Raphaelite watercolourist and philanthropist.

The family home was at Highcliffe Castle in Dorset, and had been in Stuart possession since about 1770 when Louisa's great-grandfather, John Stuart, 3rd Earl of Bute (a founder of Kew Gardens), while out botanising, discovered the cliff-top viewsite overlooking Christchurch Bay, and commissioned the architect Robert Adam, to design High Cliff, a sumptuous Georgian mansion, with grounds laid out by Capability Brown.

[citation needed] His fourth son, Lieutenant-General Sir Charles Stuart, inherited High Cliff, but landslips virtually destroyed the house, and he sold the greater part of the estate.

Louisa's childhood in Paris was marked by the early tuition she received in the arts, in keeping with being a great-granddaughter of the writer Lady Mary Wortley Montagu.

[6] It is believed that she modelled for Sir John Everett Millais in several of his works, and her beauty has been accredited as one of the inspirations of the Pre-Raphaelite Brotherhood.

The erosion losses at Highcliffe were considerable and had been reckoned at about a yard a year – the coast path was in constant need of maintenance due to cliff falls.

Those who were much in the sunshine of her gracious presence need no reminder of what she was: her noble simplicity of character, her playful humour, her warm interest, her gentle sympathy, her utter forgetfulness of self, her enthusiasm for all things good and beautiful, must be ever present with them.