Albert I may refer to:

* Albert I of Belgium ( 1875 – 1934 ), third King of the Belgians

* Albert I of Brandenburg ( c. 1100 – 1170 ), first Margrave of Brandenburg

* Albert I, Count of Namur ( c. 950 – 1011 ), a Belgian count

* Albert I, Count of Vermandois ( 917 – 987 ), Count of Vermandois

* Albert I, Duke of Brunswick-Lüneburg ( 1236 – 1279 ) second Duke of Brunswick-Lüneburg

* Albert I, Prince of Anhalt-Zerbst ( d. 1316 )

* Albert I, Duke of Prussia ( 1490 – 1568 ), first Duke of Prussia

* Albert I of Germany ( 1255 – 1308 ), King of Germany and Archduke of Austria

* Albert I of Käfernburg ( died 1232 ), Archbishop of Magdeburg

* Albert I, Prince of Monaco ( 1848 – 1922 )

* Albert I Kalonji Ditunga ( born 1919 or 1929 )

* Albert I, the first monkey in outer space ( 1948 )

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Albert the Bear (; c. 1100 – 18 November 1170 ) was the first Margrave of Brandenburg ( as Albert I ) from 1157 to his death and was briefly Duke of Saxony between 1138 and 1142.

Albert was a loyal vassal of his relation, Lothar I, Duke of Saxony, from whom, about 1123, he received the Margraviate of Lusatia, to the east ; after Lothar became King of the Germans, he accompanied him on a disastrous expedition to Bohemia in 1126, when he suffered a short imprisonment.

The defeat and death of Adolf of Nassau at the hands of Albert of Habsburg also worked to the disadvantage of the English, for all the efforts to revive the anti-French coalition came to nothing when Philip made an alliance with the new king of the Romans.

Alexander was born as son of the King Casimir IV Jagiellon of Poland and Elisabeth Habsburg of Hungary, daughter of the King Albert of Hungary.

* 1298 – The Battle of Göllheim is fought between Albert I of Habsburg and Adolf of Nassau-Weilburg.

* 1438 – Albert II of Habsburg becomes Holy Roman Emperor.

These views, and his chronic intervention in " temporal " affairs, led to many bitter quarrels with the Emperor Albert I of Habsburg, the powerful Colonna family of Rome, King Philip IV of France, and Dante Alighieri, who wrote his essay De Monarchia to dispute Boniface's claims of papal supremacy.

* 1379 – Treaty of Neuberg, splitting the Austrian Habsburg lands between the Habsburg Dukes Albert III and Leopold III.

* December – Holy Roman Emperor Rudolph I of Germany invests his sons Albert I of Germany and Rudolph II of Austria as co-rulers of the duchies of Austria and Styria, thus founding the Habsburg dynasty in those territories.

He is the successor of Charles VII Albert of Bavaria, an enemy of Habsburg, who died on January 20 of this year.

* August 10 – Albert II of Habsburg, emperor of the Holy Roman Empire

* 1282 – Holy Roman Emperor Rudolph I of Germany invests his sons Albert I of Germany and Rudolph II of Austria as co-rulers of the duchies of Austria and Styria, thus founding the Habsburg dynasty in those territories.

His maternal grandfather was the king Albert Habsburg of Hungary, king of Bohemia and " King of the Romans " of the Holy Roman Empire.

By the 1283 Treaty of Rheinfelden his father entrusted Albert with their sole government, while Rudolph II ought to be compensated by the Further Austrian Habsburg home territories.

A rising among his Styrian dependents compelled Albert to recognize the sovereignty of his rival, and to confine himself for a time to the government of the Habsburg lands at Vienna.

Albert, by the grace of God king of the Romans, duke of Austria and Styria, lord of Carniola, over the Wendish Mark and of Port Naon, count of Habsburg and Kyburg, landgrave of Alsace

Full titulature Albert possessed went as follows: Albert, by the grace of God elected King of the Romans, always August, King of Hungary, Dalmatia, Croatia, Rama, Serbia, Galicia, Lodomeria, Cumania and Bulgaria, elected King of Bohemia, duke of Austria, Styria, Carinthia and Carniola, margrave of Moravia, Lord of the Wendish March and Port Naon, Count of Habsburg, Tyrol, Ferrete and Kyburg, etc.

Though Louis was partly educated in Vienna and became co-regent of his brother Rudolf I in Upper Bavaria in 1301 with the support of his Habsburg mother Matilda and her brother King Albert I, he quarrelled with the Habsburgs from 1307 over possessions in Lower Bavaria.

The duchy of Carinthia was released as an imperial fief on 2 May 1335 in Linz to his Habsburg relatives Albert II, Duke of Austria and Otto, Duke of Austria.

Another of his sons, Matthias, also became emperor ; three others, Ernest, Albert and Maximilian, took some part in the government of the Habsburg territories or of the Netherlands, and a daughter, Elizabeth, married Charles IX of France.

Although Albert himself only reigned for a year, from then on, every emperor was a Habsburg, with only one exception, and Austria's rulers wee also the Holy Roman Emperors, till 1806.

* September 9 – Treaty of Neuberg signed, splitting the Austrian Habsburg lands between brothers Albert III and Leopold III.

* January 1 – Albert II of Habsburg becomes King of Hungary.