The experiment was carried out to evaluate the effect of different commercial diets (CD) on the growth, and feed efficiency of Thai crickets, and their nutritional composition. The experiment was arranged in a completely randomized design into 3 treatments and 4 replicates with each repetition being 500 crickets at 7 days old. So, there was a total of 6000 crickets being used in this experiment and it was carried out for 6 weeks. The experimental treatments included Control (Con) used only fresh young cassava leaves; Diet 1: a CD1 contained 2-phase feedings of 18% CP with 3000 kcal ME/kg and 20% CP with 2800 kcal ME/kg for 7-21 and 22-49 days of age, respectively; and Diet 2: a CD2 contained 19% CP and 3150 kcal ME/kg; 21% CP and 3000 kcal ME/kg, respectively. The results showed that at 21, 42, and 49 days old, the body weight of crickets in Diet 2 was the highest, followed by Diet 1 and the lowest was in Con (P

Keywords: Cricket, FCR, weight gain, EE, protein