Sara Louisa Blomfield (née Ryan; 1859 – 1939) was a distinguished early member of the Bahá'í Faith in the British Isles, and a supporter of the rights of children and women. She became styled Lady Blomfield after her husband was knighted in 1889.
Blomfield joined the Bahá'í Faith in 1907 and soon became one of its outstanding proponents and historians. During the visit of 'Abdu'l-Baha to Paris, she took copious notes of his public meetings which were used in preparing the volume called "Paris Talks". As a tribute to her, 'Abdu'l-Baha bestowed upon her the name "Sitárih Khanum" (in Persian, "sitárih" means "star", and "khanum" means "lady"). After the passing of 'Abdu'l-Baha in 1921, Blomfield traveled to Haifa and, while there, interviewed members of Baha'u'llah's family. Those recorded recollections, together with her account of the days when she hosted 'Abdu'l-Baha in London, make up the contents of her book, "The Chosen Highway."