Sultan of Brunei
Net worth: $20 billion

With a personal fortune estimated at $20 billion, the Sultan of Brunei is easily on the list of wealthiest head of states. With wealth gained from his country’s vast reserves of oil and natural gas, the absolute monarch has also used his riches for the benefit of his citizens by doing away with personal income taxes, giving free education and universal healthcare. In short, he is a one-man nation man.