Pierre-Paul-Henri-Gaston Doumergue (Aigues-Vives, Gard, 1 August 1863 – 18 June 1937 in Aigues-Vives) was a French politician of the Third Republic.

Doumergue came from a Protestant family. Beginning as a Radical, he turned more towards the political right in his old age. He served as Prime Minister from 9 December 1913 to 2 June 1914. He held the portfolio for the colonies through the ministries of Viviani and Briand until the Ribot ministry of March, 1917, when he was sent to Russia to persuade the Kerensky government not to make a separate peace with Germany and Austria. He was elected the twelfth President of France on 13 June 1924, the only Protestant to hold that office. He served until 13 June 1931, and again was Prime Minister in a conservative national unity government, following the riots of 6 February 1934. This government lasted from 6 February to 8 November 1934.

He was widely regarded as one of the most popular French Presidents, particularly after highly controversial Alexandre Millerand, who was his predecessor. Doumergue was single when elected, and became the first President of France to marry in office.