The currency in Monte Carlo is the Euro (EUR).
Monte Carlo uses the euro, so you can either change your money before your holiday via our travel money website or exchange it when you arrive. It’s always a good idea to carry some cash, even if it’s just for small purchases or trips to the casino.
There are also plenty of ATMs dotted around the city where you can withdraw euros, but make sure you let your bank know first so you don’t incur any charges. The same goes if you’re planning on using your card.