August Belmont, Prussian-American financier and diplomat, 16th United States Ambassador to the Netherlands (died 1890)

August Belmont Sr. was a German-American financier, diplomat, and politician. He served as Chair of the Democratic National Committee from 1860 to 1872. He was also a thoroughbred racehorse owner and the founder and namesake of the Belmont Stakes, the third leg of the Triple Crown of American Thoroughbred horse racing.

The United States diplomatic mission to the Netherlands consists of the embassy located in The Hague and a consular office located in Amsterdam.