The objective of the study is to reveal the seasonal variations of heavy metal concentrations in fish, water and sediment collected near seashore of Bay of Bengal in Marina, the longest urban beach in India. The concentrations of 5 heavy metals (Arsenic (As), Cadmium (Cd), Chromium (Cr), Lead (Pb) and Mercury (Hg)), were determined in water, sediment and marine species, Indo-Pacific king mackerel popularly known as Spotted Seer fish (Scomberomorus Guttus) from Marina sea shore in 4 different seasons. The concentrations of heavy metals in each sample were determined using AAS method. The study shows that there is no much seasonal variation in concentrations of the heavy metals in fish samples. The higher concentrations of most of the heavy metals in water samples were observed in monsoon season and sediment samples in summer season.