Sir Horace George Montagu Rumbold, 9th Baronet, was a British diplomat. A well-travelled man who learned Arabic, Japanese and German, he is largely remembered for his role as British Ambassador to Berlin from 1928 to 1933 in which he warned of the ambitions of Hitler and Nazi Germany.

Sir Horace Rumbold, 8th Baronet, was a British diplomat who was minister or ambassador to several countries. He succeeded his brother, Charles, as Baronet in 1877.