To hire a car in Dublin, you will need a valid driver's license, a credit card, and proof of insurance. If you are from a non-EU country, you may also need an International Driving Permit. Additionally, you will need to be at least 21 years old, although some rental companies may require you to be 25 or older. It's always a good idea to check the specific requirements of the car hire company you are interested in before making a reservation.