The objective of this study was to evaluate the effects of crude glycerin (Gly) combined with energy sources on performance and carcass characteristics of Nellore bulls fed tropical pasture during the finish phase. Sixty Nellore bulls (424 ± 34 kg; 20 ± 2 mo) were distributed in a completely randomized design (5 animals per paddock and 3 paddocks per treatment) with 4 experimental treatments in a 2 × 2 factorial arrangement (high or low starch, with or without a source of oil). The experimental period lasted 133 d, divided in adaptation (21 d) and 4 periods of 28 d each. The animals were allocated into 12 paddocks of 1.8 ha, consisting of Brachiaria brizantha ‘Xaraés’ in the dry season, and supplemented at the rate of 1000 g·100 kg⁻¹ of BW, daily, at 1000 h. The supplements were: T1 - Gly with high starch (corn), T2 - Gly with low starch (soybean hulls), T3 - Gly with high starch associated with a source of oil (corn and soybeans), and T4 - Gly with low starch associated with a source of oil (soybean hulls and soybeans). Crude glycerin (83.9% of glycerol), a byproduct from the biodiesel agroindustry, was used in all supplements to replace (28% of DM) corn or soybean hulls. Average daily gain (ADG) was measured by weight changes during successive weightings of the animals in each experimental period. After 133 d of feeding, all the animals were slaughtered with 546 ± 43 kg of shrunk BW and was determined the hot carcass weight (HCW), dressing percent (DP), and daily carcass gain (CrG). Data were analyzed using the PROC MIXED of the SAS with α = 0.05 and F-test, animal was the experimental unit. There was no interaction between starch × oil for final BW, ADG, HCW, DP, and CrG (P = 0.11). However, animals supplemented with oil increased final BW (P = 0.01), ADG (P = 0.02), HCW (P < 0.01), and GrC (P = 0.01). Independently of starch level utilized, there was an increase of 7.4% (ADG), and 2.5% (HCW) for animals fed with oil compared with without oil. Oil supplementation associated with Gly may be effective to improve performance and final carcass characteristics of Nellore bulls finished on pasture.