Sir Fitzroy Hamilton Niall Anstruther-Gough-Calthorpe, 1st Baronet (5 July 1872 – 29 September 1957), born FitzRoy Hamilton Niall Lloyd-Anstruther, was an English baronet.
[2] His paternal grandparents were James Hamilton Lloyd-Anstruther (1806–1882) and Georgiana Charlotte Burrell (1811–1843), who had been married in 1838.
Georgiana's paternal grandparents were Peter Burrell, 1st Baron Gwydyr and Priscilla Bertie, 21st Baroness Willoughby de Eresby.
[3] He had a brother, Reginald Lloyd-Anstruther, who died as a child in 1875, and a sister, Rosalind Gertrude (died 1903), the wife of Brigadier General Noel Armar Lowry-Corry (1867–1935), by whom she had issue.
Before the First World War he served as a part-time Lieutenant in the Army Motor Reserve, then in September 1915 was appointed as an ADC on the General Staff, ending the war with the rank of Captain.