DBA programs taught completely in German are rare. Most doctorates of business administration worldwide are designed completely in English and require the doctoral thesis to be written in English as well.
DBA in German
The Luxembourg-based Business Science Institute (BSI) goes a different way now and recently launched two new DBA programs taught in German: the Frankfurt DBA with residential periods in Frankfurt and Luxembourg and the Online DBA primarily taught through the BSI platform. Graduates from these progtrams receive a degree from the iaelyon School of Management of the University Jean Moulin Lyon III.