Atarsamain (also Attar-shamayin and Attarshamayin; morning star of heaven) () was an astral deity of uncertain gender, worshipped in the pre-Islamic northern and central Arabian Peninsula. Worshipped widely by Arab tribes, Atarsamain is known from around 800 BC and is identified in letters of the Assyrian kings Esarhaddon and Assurbanipal. Atarsamain may be identical with Allāt, whose cult was centred on Palmyra and also with Attar.