Two experiments were carried out to determine optimal metabolizable energy (ME) level for Guinea fowl from 5 to 14 weeks of age. The first experiment was conducted on 150 birds at 5 weeks of age (experimental period from 5 to 8 weeks of age) and the second one was conducted on 150 birds at 9 weeks of age (experimental period from 9 to 14 weeks of age). Birds in each treatment were selected in the the same breed, sex, initial weight and take care conditions. Diet nutrient density of amino acids and others met NRC (1994) recommennded and similar to treatments. Feed was fed ad libitium in pellet by long trough. Drinking water provided by semi automatic nipple drinker. Both experiments were completely designed at random with five treatments and three replications. The treatments in the first experiment were ME levels of 2800, 2900, 3000, 3100 and 3200 kcal/kg dry matter (DM), respectively, and in the second experiment were ME levels of 2900, 3000, 3100, 3200 and 3.300 kcal/kg DM, respectively. The results showed that the dietary ME levels of 3100 and 3200 kcal/kgDM were optimal for guinea fowl from 5 to 8 weeks of age and from 9 to 14 weeks of age, respectively in weight gain, feed conversion ratio and carcass quality.