Depending on your nationality, you may or may not have to naturalize your driving license when travelling to Hungary.
Citizens from the countries that joined the International Vehicular Agreement of Vienna (Austria, Bahamas Islands, Bahrain, Belarus, Belgium, Brazil, Bulgaria, Central African Republic, Czech Republic, Croatia, Cuba, Denmark, Estonia, Finland, France, Germany, Greece, Guyana, Iran, Israel, Italy, Ivory Coast, Kuwait, Poland, Latvia, Lithuania, Luxembourg, Republic of Macedonia, Morocco, Moldova, Monaco, Niger, Norway, Russian Federation, Pakistan, the Philippines, Romania, San Marino, Senegal, Slovakia, Slovenia, South Africa, Switzerland, Islands of the Seychelles, Sweden, Tajikistan, Turkmenistan, Ukraine, Uruguay, Zaire, Zimbabwe) do not have to naturalize their driving licenses.
All other citizens have to naturalize their driving license for legal driving in Hungary.
In order to do so, an official translation of the original driving license has to be conducted. Furthermore, the applicant has to pass several exams:
Once these exams have been passed, the application for naturalization can be submitted to the local Vehicular Supervisor Authority. The application also has to include a valid residence permit and the original driving license.