The achievement of arms of Austria-Hungary was that country's symbol during its existence from the Austro-Hungarian Compromise of 1867 to its dissolution in 1918. The double-headed eagle of the ruling House of Habsburg-Lorraine was used by the common Imperial and Royal (k. u. k.) institutions of Austria-Hungary or the dual monarchy. Additionally, each of the two parts of the real union had its own coat of arms.

As the double-headed eagle was reminiscent of the Reichsadler insignia of the defunct Holy Roman Empire and also the symbol of the Cisleithanian ('Austrian') half of the real union, the Hungarian government urged for the introduction of a new common coat of arms, which took place in 1915, in the midst of World War I. The new insignia combined the coats of arms of the separate halves of the Dual Monarchy, linked by the armorials of the Habsburg-Lorraine dynasty and the motto indivisibiliter ac inseparabiliter ('indivisible and inseparable' Hungarian: oszthatatlan és elválaszthatatlan).

Common coat of arms

Coat of arms	Date	Use	Description
	1867–1915	Lesser common Coat of Arms	Imperial-Royal (k.k.) coat of arms of the Austrian Empire from 1804: the double-headed eagle with marshaled arms of Habsburg, Babenberg and Lorraine displayed on the Escutcheon, Order of the Golden Fleece and Imperial Crown
	1867–1915	Medium common Coat of Arms	With armorials of (counterclockwise): Hungary, Galicia, Lower Austria, Salzburg, Styria, Tyrol, Carinthia and Carniola, Silesia and Moravia, Transylvania, Illyria, and Bohemia
	1915–1916	Lesser common Coat of Arms	Lesser Coat of arms of Cisleithania and Transleithania under the Imperial Crown and the Crown of Saint Stephen resp., linked by the crowned Habsburg-Lorraine armorials, the Order of the Golden Fleece, and the motto indivisibiliter ac inseparabiliter
	1916–1918	Lesser common Coat of Arms	Lesser Coat of arms of Cisleithania and Transleithania under the Imperial Crown and the Crown of Saint Stephen resp., linked by the crowned Habsburg-Lorraine armorials, the Order of the Golden Fleece, and the motto indivisibiliter ac inseparabiliter (same as 1915 version with Croatia added to lesser arms of the Lands of the Crown of Saint Stephen)
	1915–1918[1]	Medium common Coat of Arms	Medium Coat of arms of Cisleithania and Transleithania (see below) with supporters: a griffin in the dexter (for Austria) and an angel (for Hungary) in the sinister.

Coat of arms of the two constituent countries

Coat of arms	Date	Use	Description
	1915–1918	Austria's medium coat of arms
	1915–1918	Austria's small coat of arms
	1915–1918	Hungary's medium coat of arms	So-called "angel coat of arms" with coats of arms of Croatia, Slavonia, Dalmatia, Bosnia and Herzegovina, Transylvania, the city of Rijeka and Kingdom of Hungary
	1916–1918	Hungary's small coat of arms	Coats of arms of Kingdom of Hungary and Kingdom of Croatia, two kingdoms that legally made the Lands of the Crown of Saint Stephen

Regional coat of arms

Coat of arms	Date	Use	Description
	1867–1918	Kingdom of Bohemia
	1867–1918	Kingdom of Croatia-Slavonia	Coat of arms of the Triune Kingdom
	1867–1918	Kingdom of Dalmatia
	1804–1918	Kingdom of Galicia and Lodomeria
	1867–1918	Duchy of Styria
	1867–1918	Margravate of Istria
	1878–1918	Condominium of Bosnia and Herzegovina