The capital of Austria is VIENNA, a city of 6 letters. VIENNA is the largest city in Austria and is also the country's cultural, economic, and political center. It is located on the Danube River and is known for its Baroque architecture, imperial palaces, and vibrant music scene. VIENNA has been an important city since the Middle Ages and was once the seat of the Habsburg dynasty. Today, it is a major European city and a popular tourist destination.