Effects of dietary fiber type on fat digestibility, intestinal and fecal concentrations of bile acids and plant sterols were determined. Forty-eight Genesus [(Yorkshire-Landrace) × Duroc] barrows (25.0 ± 0.32 kg BW) were housed in pairs and assigned to 3 diets; corn-soybean meal-based diet (control), 12% flaxseed meal (FM)- and 10% oat hulls (OH)-containing diets. All diets were replicated 8 times in a completely randomized design. Titanium oxide was added in the diets as an indigestible marker. Diets were formulated to be iso-energetic; FM and OH were used as sources of soluble and insoluble fiber, respectively. The analyzed dietary NDF content (% as fed) was 9.4, 18.0 and 18.7% in the control, FH and OH, respectively. After 28 d of ad libitum feeding, fecal samples were collected from each pen, and then pigs were slaughtered to sample ileal and cecal digesta for the assessment of fat, bile acids and sterols concentrations. Fat digestibility in pigs fed FM-based diets was 24% lower (P = 0.02) than the control, whereas that of OH-based diets fed pigs was intermediate. The ileal deoxycholic acid concentrations in pigs fed OH- and FM-containing diets were increased (P < 0.01) by 46.3% and 30.1%, respectively, compared with the control. In the cecal contents, the total bile acids concentration was increased (P < 0.01) by 114 and 75% in pigs fed FM- and OH-containing diets, respectively. The total bile acids excreted in feces of pigs fed FM- and OH-rich diets were respectively 2.47- and 2.03-fold higher than in control fed pigs. Compared with the control, intestinal bioconversion of cholesterol (coprostanol: cholesterol) was enhanced more in pigs fed FM- and OH-containing diets (P = 0.05). Pigs fed FM- and OH-containing diets had higher cecal (P < 0.01) and fecal (P = 0.002) cholesterol concentrations than control fed pigs. In summary, soluble fiber reduces fat digestibility more than insoluble fiber, and malabsorption of fat can be attributed to deconjugation of bile acids.