Fibrous ingredients, such as distillers dried grains with solubles (DDGS), are a price competitive source of energy in swine diets, but TDF may decrease nutrient digestion and absorption as well as energy utilization. However, we know little about the effects of ATTD of TDF on nutrient digestibility and energy utilization. Therefore, the objective of this study was to evaluate the effect of different fiber sources on ATTD of TDF and GE of finishing pigs. A total of 34 barrows and 2 gilts (Large White × Danish Landrace) with an average BW of 84.0 ± 7.2 kg were used in a changeover design with 2 consecutive 13-d periods, and involving 10-d of adaptation and 3-d of fecal and urine collection. During each period, the 36 pigs were allotted to 4 blocks by BW, 9 pigs in each block were fed 9 different experimental diets. Diets were formulated to contain similar concentration of TDF, from 3 sources of 3 ingredients (wheat straw, WS; soybean hulls, SBH, and DDGS). TiO₂ (0.5%) was used in diets as an indigestible marker. The direct procedure was used to measure ATTD of DM, GE, CP, acid ether extract (AEE), and TDF in the diets. Results showed that ATTD of DM, GE, and TDF of pigs fed the diet with SBH (87.4, 86.8%, and 78.9%) were greater (P < 0.01) than those fed DDGS (82.6, 80.1%, and 43.0%), which were greater (P < 0.01) than those fed WS (75.1,75.8%, and 26.7%). The ATTD of DM and GE were (R² = 0.84 and R² = 0.85) correlated with ATTD of TDF among diets. Between sources of the same ingredient, we observed differences (P < 0.01) in ATTD of TDF among 3 DDGS sources (36.0, 43.1, and 49.8%), but not for WS, or SBH. Among sources of DDGS, the correlation between ATTD of DM and GE to ATTD of TDF was poor (R² = 0.62 and R² = 0.51). In conclusion, ATTD of TDF is a good predictor of ATTD of DM and GE among fibrous ingredients, but it is less predictive among sources of the same ingredient because ATTD of TDF does not affect ATTD of GE, CP, or AEE.