Avis Rent a Car System, LLC is a car rental company headquartered in Parsippany Troy Hills Township, New Jersey, United States. Avis, Budget Rent a Car and Budget Truck Rental are all units of Avis Budget Group.

Avis Budget Group operates the Avis brand in North America, Latin America, the Caribbean, India, Australia and New Zealand. In other parts of the world, the Avis brand is operated by Avis Europe plc, a separate company which licenses the Avis brand from Avis Budget Group. All together, Avis currently has over 4000 branch offices worldwide. Avis is one of the largest car rental agencies in the world.

The company primarily rents General Motors (GM) vehicles, such as Chevrolet, Pontiac, and Saturn, within the United States, though some locations feature other popular non-GM brands, such as Hyundai or Kia.

Avis is a leading rental car provider to the commercial segment serving business travelers at major airports around the world, and to leisure travelers at off-airport locations; many of the off-airport locations (at least in the USA) are franchised operations rather than company owned and operated, as is the case with most airport locations. Avis was the first car rental business to be located at an airport.