This list details national leaders since 1900 who ruled for 30 years or more, and were not self-described royalty. It also combines all national leader level offices held concurrently or consecutively by each individual.
9 July 1926 (1st time)
6 March 1932 (2nd time)
1 March 1950 (3rd time)
15 December 1931 (1st time)
21 January 1949 (2nd time)
5 April 1975 (3rd time)
1 April 1919 (1st time)
9 March 1932 (2nd time)
13 June 1951 (3rd time)
20 March 1957 (4th time)
25 June 1959 (5th time)
9 January 1922 (1st time)
18 February 1948 (2nd time)
2 June 1954 (3rd time)
23 June 1959 (4th time)
24 June 1973 (5th time)
8 February 1979 (1st time)
25 October 1997 (2nd time)