Holy Roman Empress or Empress of the Holy Roman Empire is the title given to the consort (wife) or regent of the Holy Roman Emperor. The elective dignity of Holy Roman Emperor was restricted to males only, therefore there was never a Holy Roman Empress regnant, though women such as Theophanu or Maria Theresa of Austria, who controlled the power of rule, served as de facto Empresses regnant.
Before 924, the title of Emperor was not always associated with the German Kingdom; rather, it was initially associated with the Carolingian dynasty, and then possessed by several other figures of the 9th and 10th centuries. Their consorts were thus Empresses, but not necessarily German Queens.
With the elevation of Otto I of Germany in 962 to the Imperial title, the title 'Roman King/Emperor' became inaliably associated with the Kingdom of Germany - although a King of Germany might not bear the Imperial title, it would eventually become impossible to conceive of a Holy Roman Emperor not being King of Germany. The following were all Queens of Germany as well as Roman Empresses.