|Use||Civil flag and ensign|
|Design||Three equal horizontal bands of red, white, and red|
|Variant flag of Austria|
|Use||State and war flag and state and naval ensign|
|Design||Three equal horizontal bands of red, white, and red, with the coat of arms surmounted|
The flag of Austria has three equal horizontal bands of red (top), white, and red. The Austrian triband is the second-oldest flag in use at least since 1230, after the Danish flag (which has been in use since 1219).
The flag traces back to the coat of arms of the medieval Babenberg dynasty, a silver band on a red field (in heraldry: Gules a fess Argent). The origin of the Bindenschild has not been conclusively established, it possibly derived from the Styrian margraves of the Otakar noble family, who themselves may have adopted the colours from the descendants of the Carinthian duke Adalbero (ruled 1011-1035), a scion of the House of Eppenstein extinct in 1122. However, already the Babenberg margrave Leopold III of Austria (1095-1136) was depicted with a triband shield in 1105.
When the last Otakar Duke Ottokar IV of Styria died in 1192, the Styrian duchy was inherited by the Babenberg duke Leopold V of Austria according to the 1186 Georgenberg Pact. According to the 18th century historian Chrysostomus Hanthaler, his grandson Duke Frederick II of Austria (1230-1246), nicknamed the "Quarrelsome" or the "Warlike", the last of the Babenberg dynasty, designed a new coat of arms in red-white-red after his accession—an attempt to prevail against reluctant local nobles and to stress his autonomy towards Emperor Frederick II. The triband is first documented in a seal on a deed issued on 30 November 1230, confirming the privileges of Lilienfeld Abbey. The medieval chronicler Jans der Enikel reports that the duke appeared in a red-white-red ceremonial dress at his 1232 accolade in the Vienna Schottenstift.
The Babenberg family colors developed to the coat of arms of their Austrian possessions. After the dynasty had become extinct with Frederick's death at the 1246 Battle of the Leitha River, they were adopted by his Přemyslid successor King Ottokar II of Bohemia. Upon the 1278 Battle on the Marchfeld the colours were assumed by the victorious House of Habsburg and gradually became the coat of arms of the dynasty's Hereditary Lands within the Habsburg Monarchy.
According to legend, the flag was already invented by Duke Leopold V of Austria as a consequence of his fighting during the Siege of Acre. After a fierce battle, his white surcoat was completely drenched in blood. When he removed his belt, the cloth underneath was untouched by it, revealing the combination of red-white-red. So taken was he by this singular sight that he adopted the colors and scheme as his banner. The incident was already documented about 1260, though it is highly unlikely.
In fact, the war flag of the Holy Roman Empire during the crusades was a silver cross on a red field quite similar to the later Austrian arms. This ensign was used by the Austrian capital Vienna from the late 13th century onwards.
Since the days of Rudolph of Habsburg and the 1283 Treaty of Rheinfelden, the combination of red-white-red was widely considered to be the Austrian (later also Inner Austrian) colours used by the ruling Habsburg dynasty. However, the national flag (in a modern sense) of the Austrian Habsburg Monarchy, like the later Austrian Empire and the Cisleithanian part of Austria-Hungary until 1918, was black-yellow. These were the family colours of the Imperial House of Habsburg, and were themselves in part derived from the banner of the Holy Roman Empire.
Beginning in the reign of Emperor Joseph II, the Austrian, later Austro-Hungarian Navy used a Naval Ensign (Marineflagge) based on the red-white-red colours, and augmented with a shield of similar colours. Both of these flags became obsolete with Austria-Hungary's dissolution in 1918, and the newly formed rump state of German Austria adopted the red-white-red triband as its national flag.
Red-white-red coulour sequences are the national colours of several other countries:
The flag of Lebanon bears a close resemblance, showing the green cedar in white field. The Lebanese flag has similar upper-down red stripes with Spanish fess. One theory on the flag's design holds that since Lebanese member of parliament Henri Pharaon, who was involved in the making of the flag, was a long-time consul in Vienna and was an avid friend and founder of the "Austro-Lebanese Association of Friendship", the colors could have been inspired by the Austrian flag.
The flag of Peru resembles the colours, but has its bands aligned vertically.
The same design is also used to mark "No entry" on European inland waterways.
The Austrian flag has been the main motif of many collector coins. One of the most recent examples is the 20 euro Post War Period coin, issued by the Republic of Austria on 17 September 2003. The obverse of this coin shows the Austrian coat of arms flanked by the Austrian flag and the European Union flag.
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