Thomas de Grenier de Fonblanque,[1] KH, (26 January 1793 – 1861) was a British diplomat, Her Britannic Majesty's Consul General and Consul-General to Serbia.
Thomas's mother, Frances Caroline Fitzgerald, was a granddaughter of Colonel Samuel Martin of Antigua, West Indies and niece of Samuel Martin.
Thomas de Grenier de Fonblanque married Jane Catherine Barrington, of Dublin, daughter of Sir Jonah Barrington, a judge known for his popular and amusing memoirs.
Among them was Edward Barrington de Fonblanque (1821-1895), former British military officer, writer and historian.
Another of his daughter, Adelaide Arabella de Grenier de Fonblanque (1822-1856), married count Otto von Schlippenbach, and died in Basedow, Germany.