Artur or Arthur Văitoianu (14 April 1864 in Izmail – 17 June 1956) was a Romanian general who served as a Prime Minister of Romania for about two months in 1919 (27 September – 30 November).

Earlier in the War, during the Romanian Campaign of 1916, he commanded the 10th Infantry Division at the Battle of Predeal Pass, in defense of Prahova Valley.

He managed to block the Central Powers from reaching Bucharest via the shortest way, thus preventing them from cutting off and surrounding the Romanian Army and by implication knock the country out of the war.

A War and Interior Minister in Ion I. C. Brătianu's cabinet, he came to lead the executive upon the latter's resignation over the Allied Powers' refusal to recognize the territorial awards promised to Romania upon its 1916 entry into the conflict (on the basis of Romania having signed a separate peace with the Central Powers, the Treaty of Bucharest, in the previous year); in the short hiatus, no Romanian authority was present at the signing of the Treaty of Saint-Germain with Austria.

[5] Văitoianu took office as Romanian troops were engaged in an expedition to Hungary, where they were fighting against the newly proclaimed Hungarian Soviet Republic.