Ernst Trygger (27 October 1857 – 23 September 1943) was a Swedish jurist professor and conservative politician. He served as Prime Minister of Sweden from 1923 to 1924. He also served as Minister for Foreign Affairs from 1928 to 1930 in the government of Arvid Lindman. He was a member of the first chamber of the Swedish Riksdag from 1898 to 1937, and also leader of the conservatives in that chamber from 1913 to 1933.