ABSTRACT. – The wedge clams Donax are the dominating group of filter feeding community on sandy beaches worldwide. These wedge clams are primary consumers that provide a significant biomass and abundance to the marine ecosystem. In the Indian coast, Donax faba is used as food, fish bait and decorative items. Allometry of the edible wedge clam, D. faba was carried out to understand the relationship between length and weight (total weight, wet tissue weight and dry tissue weight), from a polluted site (Panambur) and an unpolluted site (Padukere) with reference to physico-chemical factors. The equations of length (L)-total weight (TW), length (L)-wet tissue weight (WW) and length (L)-dry tissue weight (DW) were TW = 0.0000963L3.2151, WW = 0.0000056L3.5555 and DW = 0.0000037L3.2611 respectively at Panambur. Whereas, at Padukere, the equations of length (L)-total weight (TW), length (L)-wet tissue weigh (WW) and length (L)-dry tissue weight (DW) were TW = 0.0000748L3.3166, WW = 0.0000092L3.3911 and DW = 0.0000067L3.0562, respectively. At this station, the b value of length-dry tissue weight was found to be isometric. t-test allowed to find significant correlations between length and dependent variables (total weight and wet tissue weight) except for dry tissue weight at Padukere. The correlation between abiotic and biotic variables was due to the habitat and season for D. faba living along the south west coast of India.