Visa is required for citizens of Germany to visit Vietnam. German nationals may have 2 options: Visit Vietnam embassy in Germany or apply for a visa on arrival to Vietnam from Germany online. German citizens may apply for both tourist and business visa to Vietnam for the stay of 1 to 6 months from Germany. Please check this link for visa fee for German citizens.

All the information for getting a visa from Vietnam embassy in Germany can be found here: http://www.vietnambotschaft.org/