An optimum plant population can maximize the plant output so this field experiment was conducted to know about the Response of different planting density on various genotypes of cotton for yield maximization. In this experiment three cotton genotypes viz. hirsutum cotton (AKH-081), arboreum cotton (AKA-7) and Bt cotton (Balwan), with three plant densities level of 100 %, 150 % and 200 % of normal for respective genotype, were laid out in factorial randomized block design. Bt cotton Balwan recorded higher growth in terms of leaf area, dry matter weight and yield attributes plant-1 . | Influences of different planting density on growth yield attributes and yields of hirsutum arboreum and bt cotton