Baroness Olga de Meyer (born Maria Beatrice Olga Alberta Caracciolo; 8 August 1871 – 6 January 1931) was a British-born artists' model, socialite, patron of the arts, writer, and fashion figure of the early 20th century. She was best known as the wife of photographer Adolph de Meyer and goddaughter of King Edward VII, who was also rumoured to be her biological father. After 1916, she preferred to be known as Mahrah de Meyer.