Formal:
* Votre volonté: This is the most literal translation and is appropriate for formal situations.
* Votre testament: This refers specifically to a legal document outlining the distribution of one's assets after death.
Informal:
* Ce que vous voulez: This means "what you want" and is more casual.
* Votre désir: This is similar to "your will" in the sense of wanting something.
The best translation will depend on the specific context and the desired level of formality.