Vyacheslav (Viacheslav) Prokopovych (Ukrainian: В'ячеслав Костянтинович Прокопович) (1881, Kiev - 1942, Bessancourt) was a Ukrainian politician and historian.
Starting in 1905, he was a politician of the Ukrainian Democratic-Radical Party (UDRP), established in Kiev. At the end of World War I, he was a member of the Ukrainian Party of Socialists-Federalists (UPSF) and Central Rada. In 1918, he served as the minister of education in a cabinet of Ukrainian People's Republic (UNR), headed by Vsevolod Holubovych. On 26 May 1920, Viacheslav Prokopovych became the prime minister of the UNR until October 14, 1920.
At the beginning of 1921 the government of the UNR went into exile. The cabinet was headed twice by Prokopovych (March - August 1921, and May 1926 - October 1939). The members of the Government-in-exile of the Ukrainian National Republic lived in the principal émigré centers: Warsaw, Prague, and Paris. In 1925-1939, he was also a founder and chief editor of Tryzub, published in Paris.