Aulus Postumius Albus Regillensis was a patrician politician of ancient Rome, and apparently son of Aulus Postumius Albus Regillensis, and therefore brother of Spurius Postumius Albus Regillensis. He was consul in 464 BC, carried on war against the Aequians, and protected the border from raiders. Before the Battle of Mons Algidus he was sent as ambassador, along with Quintus Fabius Vibulanus and Publius Volumnius Amintinus Gallus, to the Aequians in 458 BC, on which occasion he was insulted by their commander, who told him to take Rome's entreaties and tell them to an oak tree.
This article incorporates text from a publication now in the public domain: Smith, William, ed. (1870). "Albinus (3)". Dictionary of Greek and Roman Biography and Mythology. 1. p. 91.