Aulus Postumius Albinus (c. 151 – 89 BC) was a Roman senator and military commander. In 110 BC, he went to serve on the staff of his brother, Spurius, in the war against the Numidian king Jugurtha. Left in charge of the troops during the winter, Aulus decided on a rash foray which involved the army in a humiliating defeat and surrender. The disaster led to the establishment of a commission which condemned several prominent aristocrats of collusion with the enemy during the war. Aulus himself was seemingly not condemned, and went on to be elected consul a decade later, in 99 BC. In 89, Aulus held command of a fleet during the Social War in Italy, but proved to be an unpopular commander and was murdered by his troops.