For the physical space:
* Hall d'entrée: This is the most common and general term for a lobby, meaning the entrance hall of a building.
* Hall: This can also be used for a lobby, though it's less specific than "hall d'entrée".
* Vestibule: This refers to a small, enclosed space leading to a larger room, which can sometimes be used as a lobby.
For the group of people lobbying for a cause:
* Lobby: The English word "lobby" is used directly in this context, though it's often translated as "groupe de pression" (pressure group).
Example:
* "I'm waiting for you in the hall d'entrée." (I'm waiting for you in the lobby.)
* "The lobby is trying to influence the government." (The pressure group is trying to influence the government.)
So, the best translation for "lobby" in French will depend on the specific context.