How do you say - have a great week in french?

There are a few ways to say "have a great week" in French, depending on the level of formality and the context:

Formal:

* Bonne semaine! (This is the most common and straightforward way to say it.)

* Passez une excellente semaine! (This is a more polite and formal way to say it.)

Informal:

* Bonne semaine à toi/vous! (This is a more informal way to say it, using "toi" for singular and "vous" for plural.)

* Profite bien de ta/votre semaine! (This means "Enjoy your week!")

Other options:

* Je te/vous souhaite une bonne semaine! (This means "I wish you a good week!")

* Je te/vous souhaite une semaine agréable! (This means "I wish you a pleasant week!")

The best option for you will depend on the situation and your relationship with the person you are speaking to.