عبادان
Bahman Nassim was born in February, 1940, in Abadan, Iran, to Ramezan Nassim Naseri and Farideh Hasson. Ramezan Nassim was employed with the NIOC as the Head of Accounting for the company in Abadan, Iran. Due to the high standing within the society, each of the children within the family enjoyed a comfortable and active life. Sports were a big part of the families activities, with sons and daughters involved in swimming, diving, water polo, and basketball. Bahman Nassim was brought onto the Iran national swimming and water polo team in 1958, where he remained until 1965. Hossein Nassim, Bahman's younger brother was coached, mentored, and trained in swimming and water polo by Bahman himself, leading to many medals and records to be achieved by Hossein.