The objective of this study was to examine the effect of feeding soybean, sunflower or linseed oils on beef quality traits of feedlot finished Nellore steers. Ninety-six steers were individually fed one of the following diets: CON = a control diet with 79% of concentrate and 21% of corn silage, without oil; SOY = diet with soybean oil; SUN = diet with sunflower oil; LIN = diet with linseed oil. Different oil sources were included at 3.5% of DM in substitution of corn at the same percentage. After 84 d of feeding steers were harvested and after 48 h of chilling 2 samples of Longissimus muscle (2.5 cm thick) were collected between 12th and 13th ribs, vacuum packed and aged for 0 and 14 d. Samples were analyzed for pH, color (L*, a*, b*), cooking loss (CL) and Warner-Bratzler shear force (WBSF). Data were analyzed using the MIXED procedure of SAS software as a randomized complete block (initial body weight) design, considering treatment, aging period, treatment × aging interaction as fixed effects, and block as a random effect. There was no treatment × aging period interaction for any trait. Treatments did not affect any trait evaluated in this study (P > 0.05). The average pH values (5.6 ± 0.02) were within the normal range for all treatments. The WBSF also did not differ among treatments but the average values (8.2 ± 0.46 kg) were considered very high, indicating a tough meat. The average cooking loss was 23.9 ± 1.71% and also is within the range normally reported in the literature for Nellore cattle. Color attributes averaged 32.7, 14.7 and 12.6 for L*, a* and b*, respectively. The pH showed a small increase with aging period, from 5.5 to 5.6 (P < 0.001) but was within the normal range. The WBSF and CL decreased with increase of aging period (P < 0.001) from 10.5 to 6.0 kg for WBSF and from 25.6 to 22.2% for CL for 0 and 14 d of aging, respectively. The L* values increased with aging period (P < 0.001) from 29.4 to 35.9, however the a* (14.6 ± 0.70) and b* (12.6 ± 1.80) values were not affected by aging. Inclusion of different oil sources does not affect meat tenderness and color attributes of feedlot finished Nellore steers.