Abstracts: An investigation was conducted on 540 semi-scavenging chickens of two age groups (below 6 month and above 6 month) taking equal number from each of 6 upzilas (sub-district) under 4 districts in 3 seasons (Summer, Winter and Rainy season). The birds were collected from farmer's house between 4: 0 and 5: 0 pm. Collected birds were slaughtered and dissected to collect different parasites from suspected organs and crop and gizzard contents (CGC) was collected for nutritional analyses. Endoparasites were identified and categorized into nematodes, cestodes, trematodes and protozoan groups. CGC were processed and analyzed for proximate components, calcium (Ca) and phosphorous (P). More than 90% birds were positive for at least one type of parasite and nematodes was the highest incident (77%) followed by lice (67%), cestodes (59%), protozoa (39% with Eimeria being main species) and trematodes (5%). The average nematodes and cestodes loads were 9.3 and 6.4 respectively. Nematodes varied with age and area, while cestodes only varied among areas. The CGC contained 2678 Kcal/kg DM TME, 11.72% CP, 0.41% Ca and 0.34% P. Seasonal variation had significant effect on TME availability but not on CP content of CGC. Season and area and their interaction had significant effect on Ca availability. Availability of Ca and P to younger birds was less than that of to aged birds, but reverse result was found for TME. TME and CP had negative relationship with nematodes and cestodes loads while Ca showed positive relation. But P was positively related with cesodes and negatively with nematodes. Nemadodes load was positively correlated with cestodes load. So, it was concluded that all semi-scavenging birds were parasite affected with deficient nutritional status and proper nutrition might help to control the major parasites.