Can five people stay in the bellagio hotel in las vegas?

4 is almost always the limit at any hotel. Just have 1-2 people check-in.. And meet the others by the elevator or somewhere else. That'll be the last you ever hear of it.

You might want to get a suite though (2 beds and a sofa sleeper) when you do this. I've done 5, 6, 8 people in a room before.. Nobody is going to notice and nobody is going to care.

No you can only have 4 in any room at Bellagio, sure you could sneak the 5th in and you will probably get away with it but they will have no where to sleep, also if you get caught you will get thrown out. I would suggest that rather than this you get two rooms at another resort maybe Mirage ?

Mirage

https://reservations.mgmmirage.com/bookingengine.aspx?host=promo&pid=160&code=RRDLUX08&kbid=542076

Or suites at Mirage

https://reservations.mgmmirage.com/bookingengine.aspx?host=promo&pid=160&code=RRTWR08&kbid=542076

https://reservations.mgmmirage.com/bookingengine.aspx?host=promo&pid=160&code=RRPT08&kbid=542076

I think the limit is 4. BUT just have the 5th come later and not be with at check out. its by far one of the nicest hotels there. Another option is RIO which is all suites- you may have more room to spread out there.