Lady Margaret Frances Domville (née St Lawrence; 1840 – 9 January 1929) was an Irish aristocrat and a writer.
She was also the daughter of the 3rd Earl of Howth and the wife of Sir Charles Compton Domville, 2nd Bt.
Lady Margaret Frances St Lawrence was born in 1840 to Thomas St Lawrence, 3rd Earl of Howth, and his wife, Lady Emily de Burgh, who was the daughter of the John de Burgh, 13th Earl of Clanricarde.
Lady Margaret was raised a Protestant but converted to Catholicism.
The couple had no children and were the last of the Domville family to live in Santry estate.