The Imperial Army (German: Kaiserliche Armee), Imperial Troops (Kaiserliche Truppen), Exercitus Imperatoris Romani, or Imperialists (Kaiserliche) for short, was a name used for several centuries, especially to describe soldiers recruited for the Holy Roman Emperor during the Early Modern Period. The Imperial Army of the Emperor should not be confused with the Army of the Holy Roman Empire (Reichsarmee), which could only be deployed with the consent of the Imperial Diet. The Imperialists effectively became a standing army of troops under the Habsburg emperor from the House of Austria, which is why they were also increasingly described in the 18th century as "Austrians", although its troops were recruited from all over the empire.
The Habsburg monarchy supplied almost all the Holy Roman Emperors during the Early Modern Period. Their title of Emperor was one that was bound not so much to a territory, but to a person. In the tradition of the Roman Empire, the Emperor had a status that was recognised in all of Latin Europe.
Accordingly, the Imperial Army was a force established by the Emperor, with privileges in the whole of the Holy Roman Empire. The Emperor was not permitted to raise troops in the electoral states, but had inter alia the right to recruit soldiers in the imperial cities and in all other territories.
Independent of the Emperor's ability to raise his own army, the Imperial Diet could establish the Army of the Holy Roman Empire, the "troops of the empire".