Sir Thomas Barlow, 1st Baronet, KCVO, FRS, FRCP[1] (4 November 1845 – 12 January 1945) was a British royal physician, known for his research on infantile scurvy.

He became a registrar at Great Ormond Street Hospital, and later a physician and in 1899 a consultant.

[2] He was Royal Physician to Queen Victoria and attended her on her death, and to Edward VII and King George V. He was knighted as a Knight Commander of the Royal Victorian Order in March 1901,[3] and in February 1902 he was created a Baronet, of Wimpole Street in St Marylebone in the County of London.

He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1918.

[6] In 1904, he was listed honorary medical staff at King Edward VII's Hospital for Officers.