head of state
the person who holds the highest position in a national government: a meeting of heads of state.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for head of state
And the new star of the G-8 summit, the woman whose name was on everyone's lips, wasn't even invited to the head-of-state affair.
He answered each question with a head-of-state sort of deliberateness.