Milenko Radomar Vesnić (Vesnitch in French, and Wesnitsch in German; 13 February 1863 – 15 May 1921) was a Serbian politician, diplomat, cabinet member and prime minister.

In 1893, he was appointed as a university professor teaching international law at Grande École in Belgrade,[2] and the same year became MP in the National Assembly of Serbia as a member of the People's Radical Party.

[2] Vesnić travelled to Washington prior to the Peace Conference to meet with Wilson and explain the Serbian position with respect to the break-up of the Austro-Hungarian Empire.

[5] In 1920 Vesnić became Prime Minister of the Kingdom of Serbs, Croats and Slovenes,[5] and during his office, he signed the Rapallo Treaty with Italy.

[5] The former wife of Siegfried Salomon Wertheim,[7][8] her sister, Cécile Ulman, married Napoléon Louis de Talleyrand-Périgord, 8th Duke of Montmorency, as her second husband.