Yes, you can legally drive in Germany with a valid U.S. driver's license for a period of up to six months (180 days) as a tourist. During this time, your US license is fully recognized for renting cars and operating vehicles that correspond to the category listed on your license. While not strictly required by German law for US citizens, it is highly recommended to carry an International Driving Permit (IDP) alongside your original license. The IDP acts as an official translation and can be crucial if you are pulled over by police or involved in an accident, as many local officers may not be fluent in English. You can easily obtain an IDP from AAA in the US before your trip for a small fee. It is important to remember that this "tourist" privilege only applies if you do not establish residency in Germany; the moment you register an address (Anmeldung), the six-month countdown to convert your license to a German one begins. Additionally, always carry your passport when driving, as German authorities require both your license and a form of government ID to verify your legal status in the country.