France:
- Napoleon Bonaparte: Emperor of France and the central figure of the Napoleonic Wars.
United Kingdom:
- George III: King of the United Kingdom.
- William Pitt the Younger: Prime Minister during most of the Napoleonic Wars.
Austria:
- Francis II: Emperor of Austria.
Prussia:
- Frederick William III: King of Prussia.
Russia:
- Alexander I: Tsar of Russia.
Spain:
- Charles IV: King of Spain at the start of the war.
- Ferdinand VII: King of Spain after Charles IV's abdication.
Portugal:
- João VI: King of Portugal.
Sweden:
- Charles XIII: King of Sweden.
Denmark-Norway:
- Frederick VI: King of Denmark and Norway.
Ottoman Empire:
- Selim III: Sultan of the Ottoman Empire during the early stages of the Napoleonic Wars.
- Mustafa IV: Sultan of the Ottoman Empire during the later stages of the Napoleonic Wars.
It's important to note that there were many other leaders involved in the Napoleonic Wars, and this list includes some of the most prominent figures from the major countries.