Rickard Johannes Sandler (29 January 1884 – 12 November 1964) was a Swedish Social Democratic politician. He served as minister without portfolio in the Swedish government from 10 March 1920 to 30 June 1920, minister for finance from 1 July 1920 to 27 October 1920, minister without portfolio from 13 October 1921 to 19 April 1923, minister of commerce and industry from 14 October 1924 to 24 January 1925, Prime Minister from 24 January 1925 to 7 June 1926, and as minister for foreign affairs from 24 September 1932 to 19 June 1936 and again from 28 September 1936 to 13 December 1939. Sandler is the only social democratic prime minister who did not also hold the post of party chairman. He is also the second-youngest prime minister of Sweden, aged 41 when he took office.