There are more than 200 countries in the world, and all have a head of state. Note that most countries separate the roles of head of state and political leader. The United States unifies these two roles in the President. In most countries, the head of state is a ceremonial title.
Here are some heads of state:
United States: George W. Bush (both head of state and the political leader)
Canada: The Governor General (currently Michaëlle Jean) acts as head of state on behalf of Queen Elizabeth II who is Queen of Canada and the formal head of state; the political leader is Stephen Harper as Prime Minister
United Kingdom: Queen Elizabeth II; the political leader is Gordon Brown as Prime Minister
Japan: Emperor Akihito; the political leader is Yasuo Fukuda as Prime Minister
Germany: Federal President Horst Köhler; the political leader is Angela Merkel as Chancellor
Andorra: two ceremonial heads of state are the Bishop of Urgel in Spain and the President of France; the political leader is Albert Pintat as Head of Government
the secretary of state heads the state department. The current secretary of state is Hilary Rodham-Clinton.
Angela Merkel - Germany.
If you go to Wikipedia and type "List of heads of state", you'll find a list of current heads of state (and heads of government, when they are not the same person). I'll leave it to you to check which of these qualify as "presidents".
benigno simeon "noynoy" conjuanco aquino III
Ten Heads of State attended the Meeting
The current heads of state and government are listed at the related link below.
Heads of State - group - was created in 2008.
The current Secretary of State is John Kerry. The Secretary of State is one of the heads of the United States government, whose job mostly revolves around foreign affairs.
The state governor
The plural is heads of state
Russian heads of state before 1917 were called Tsars or Czars.
The cheese heads the cheese state and the Badger state.