Sir Frank Cavendish Lascelles GCB GCMG GCVO PC (23 March 1841 – 2 January 1920) was a British diplomat.

Lascelles served in junior positions at the British embassies in Madrid, Paris, Rome, Washington, D.C., and Athens.

[4] He remained in Bulgaria until 1887, and was then Minister (similar to ambassador) to Romania from 1887 to 1891[5] and to Persia from 1891 to 1894,[6] where his niece Gertrude Bell visited him, starting a lifelong passion for travel.

His tenure in Berlin saw the growing estrangement between Germany and the UK, and Lascelles notably had to deal with the effects of the Kruger telegram only days after his arrival.

Lascelles was knighted KCMG in 1886,[7] promoted to GCMG in 1892,[8] appointed GCB in 1897,[9] and GCVO in 1904 following King Edward VII's meeting with Emperor Wilhelm II at Kiel.