Twenty-four crossbred uncastrated male Santa Ines × Dorper lambs (24.9 ± 2.4 kg BW) were used to evaluate meat composition and yield of carcass and non-carcass components when fed diets containing supplementary oil sources. Treatments consisted of a control diet (CON) containing 40% corn silage, 10.8% corn grain, 9.8% soybean hulls, 37.45% sunflower meal, 0.55% urea, 1.4% mineral premix, and 2 diets containing additional 6% soybean oil (SOY) or 6% residual soybean frying oil (FRY). Lambs were blocked by initial body weight (BW), and randomly assigned to 24 individual feedlot pens. Animals were harvested when they reached 35 kg BW. Carcass and edible non-carcass components were separated and weighed. Total edible non-carcass components yield (TENC) was obtained as the sum of weights of blood, tongue, lungs + trachea, liver + gall bladder, heart, kidneys, gastrointestinal tract (reticulum, rumen, omasum, abomasum and intestines), and abdominal and kidney fats. Total yield of usable products (TUP) was calculated as the sum of hot carcass weight and TENC. A sample of Longissimus muscle was collected between 12th and 13th ribs, and evaluated for moisture, crude protein, ether extract and ash contents. Data were analyzed as a randomized block design using a mixed model, and the contrasts control × oil treatments and soybean oil × frying oil were evaluated. TENC values were 6.62, 6.56, and 6.35 kg; and TUP values were 22.27, 21.58, and 22.19 kg for CON, SOY and FRY, respectively (P > 0.10). The weight of the liver of oil-fed lambs was greater than the ones fed CON (P = 0.04). The weight of the spleen tended to be greater in lambs fed FRY (P = 0.06), while the other individual non-carcass components were not affected by treatments. The ether extract of meat tended to be greater in lambs fed diets containing oil, regardless the source (P = 0.07). The meat moisture, mineral matter, or crude protein contents were unaffected by dietary oil supplementation. Data indicate soybean-frying oil is a potential alternative energy ingredient in diets for feedlot lambs and that the inclusion of 6% of this oil does not depreciate carcass and edible non-carcass components yields, and it increases meat intramuscular fat slightly.