Columns: Nº | Cabinet (Nickname) | Took office | Left office | Duration | Coalition parties | ministers | ministries | King
1 | Jón Magnússon I | 4 January 1917 | 25 February 1920 | 3 years, 1 month, 21 days (1,147 days) | HRP — IP þversum — PP | N/A | 0 | Christian X | 2 | Jón Magnússon II | 25 February 1920 | 7 March 1922 | 2 years, 10 days (741 days) | HRP — independents | N/A | 0 | Christian X | 3 | Sigurður Eggerz | 7 March 1922 | 22 March 1924 | 2 years, 15 days (746 days) | IP — PP — independents | N/A | 0 | Christian X | 4 | Jón Magnússon III | 22 March 1924 | 8 July 1926 | 2 years, 3 months, 16 days (838 days) | CP | N/A | 0 | Christian X | 5 | Jón Þorláksson | 8 July 1926 | 28 August 1927 | 1 year, 1 month, 20 days (416 days) | CP | N/A | 0 | Christian X | 6 | Tryggvi Þórhallsson | 28 August 1927 | 3 June 1932 | 4 years, 9 months, 6 days (1,741 days) | PP | N/A | 0 | Christian X | 7 | Ásgeir Ásgeirsson | 3 June 1932 | 28 July 1934 | 2 years, 1 month, 25 days (785 days) | PP — IP | N/A | 0 | Christian X | 8 | Hermann Jónasson I | 28 July 1934 | 2 April 1938 | 3 years, 8 months, 5 days (1,344 days) | PP — SDP | N/A | 0 | Christian X | 9 | Hermann Jónasson II | 2 April 1938 | 17 April 1939 | 1 year, 15 days (380 days) | PP | N/A | 0 | Christian X | 10 | Hermann Jónasson III | 17 April 1939 | 18 November 1941 | 2 years, 7 months, 1 day (946 days) | national unity government PP — IP — SDP | N/A | 0 | Christian X | 11 | Hermann Jónasson IV | 18 November 1941 | 16 May 1942 | 5 months, 28 days (179 days) | PP — IP — SDP | N/A | 0 | Christian X | 12 | Ólafur Thors I | 16 May 1942 | 16 December 1942 | 7 months (214 days) | IP | N/A | 0 | Christian X