Sir Beilby Francis Alston (8 October 1868 – 28 June 1929) was a British diplomat who was envoy to various countries.

Beilby Alston started as a clerk in the Librarian's Department of the Foreign Office in 1890[1] and later that year in the Political Division.

Returning to London, Alston was attached to Prince Tsai Suun of China on his mission to England in 1909, and to Prince Tsai-Chen who represented the Emperor of China at the coronation of King George V in June 1911.

In December 1911 he was with Prince Alexander of Teck who represented the King at the coronation of King Rama VI of Siam (Thailand), moving on to Peking where he was Counsellor of the Legation 1911–17, and chargé d'affaires in 1913 and 1916–17 when the Minister, Sir John Jordan, was absent.

Alston was Deputy High Commissioner in Siberia 1918–19 (during the Siberian Intervention), then Minister Plenipotentiary in Tokyo 1919–20 (under the Ambassador, Sir Charles Eliot), then Envoy Extraordinary and Minister Plenipotentiary to China 1920–22,[5] then Minister to Argentina and to Paraguay 1923–25,[6] then Ambassador to Brazil from 1925 until his death.