1. France: The largest and most well-known French-speaking country in Europe.
2. Belgium: The official languages of Belgium are Dutch, French, and German.
3. Switzerland: French is one of the four official languages of Switzerland, alongside German, Italian, and Romansh.
4. Luxembourg: French is one of the official languages of Luxembourg, along with Luxembourgish and German.
5. Monaco: French is the official language of Monaco.
There are also many other countries and territories around the world where French is an official language.