| Party/Term | Prime Minister | Born... |
No Party 1856 | |
No Party 1856 1861-1862 1869-1872 1873 | |
No Party 1856-1861 1865-1869 1872 | |
No Party 1862-1863 | |
No Party 1863-1864 1882-1883 | |
No Party 1864-1865 | |
No Party 1872-1873 | |
No Party 1873-1875 1876 | |
No Party 1875-1876 | |
No Party 1876-1877 1883-1884 1884 1887-1891 | |
No Party 1877-1879 | |
No Party 1879-1882 | |
No Party 1884 1884-1987 | |
| | Party/Term | Prime Minister | Born... |
Liberal 1891-1893 | |
Liberal 1893-1906 | |
Liberal 1906 | |
Liberal 1906-1912 1928-1930 | |
Liberal 1912 | |
Reform 1912-1925 | |
Reform 1925 | |
Reform 1925-1928 | |
United 1930-1935 | |
Labour 1935-1940 | |
Labour 1940-1949 | |
National 1949-1957 | |
National 1957 1960-1972 | |
| | Party/Term | Prime Minister | Born... |
Labour 1957-1960 | |
National 1972 | |
Labour 1972-1974 | |
Labour 1974-1975 | |
National 1975-1984 | |
Labour 1984-1989 | |
Labour 1989-1990 | |
Labour 1990 | |
National 1990-1997 | |
National 1997-1999 | |
Labour 1999-2008 | |
National 2008- | |
Labour 1974 (acting PM) | |
|