The main objective of this study titled "Persian contact with Ancient India 550-330B.C" with reference to Achammanid empire,is to project all the historical and cultural facts about the Ancient Persian contact with Ancient India and vice versa pertaining to the period- 550-330 B.C, especially in relation to the Achammanid Empire. These facts have been analysed by the evidence drawn from the available Archaeological and literary sources. The first Prime Minister of India, Jawaharlal Nehru said that Iranians were among the oldest people of the world and that the life and culture of India has been influenced a lot by Iranian civilization and culture.It is clear that both people Indian and Iranian,have had close relations in the literary, culture, civilization, architectural and artistic fields. The Rig Veda and Avesta, which are ancient Indian and Iranian Scriptures respectively have close relation in terms of religious ideas.Around 600 B.C,much of northern India witnessed the spread of the famous northern Black Polished ware. Around that time,the king of Magadha in modern Bihar named Bimbisara, is reported to have had contacts with king of Gandhara.......