Attalus (in Greek Aτταλoς; lived 4th century BC), son of Andromenes the Stymphaean, and one of Alexander's officers, was accused with his brothers, Amyntas and Simmias, of having been engaged in the conspiracy of Philotas, 330 BC, but was acquitted, together with his brothers. In 328 BC, Attalus was left with Polyperchon and other officers in Bactria with part of the troops, while the king himself marched against the Sogdians. He accompanied Alexander in his expedition into India, and was employed in several important duties. In Alexander's last illness, 323 BC, he was one of the seven chief officers who passed the night in the temple of Serapis at Babylon, in order to learn from the god whether Alexander should be carried into the temple.