List of current state leaders by date of assumption of office

This is a list of current state leaders ordered by their continuous tenure in a position of national leadership.

For leaders who held the same office prior to their state's independence, the start of their tenure is used, not independence.

For a list of heads of state taking dates of independence into account, see List of heads of state by diplomatic precedence.

Acting presidents are included in this list, but if a leader has non-consecutive terms, only the current period of service is listed.

Often a leader holds both positions in presidential systems or dictatorships.