Four trials were conducted to evaluate the effects of flint corn processing and the replacement of corn with citrus pulp (CiP) in diets for Nellore feedlot cattle. In a 103-d finishing trial, 216 Nellore bulls (350 +/- 24 kg initial BW) were used in a randomized complete block design with a 2 x 4 factorial arrangement of treatments. Factors included 2 processing methods, either ground corn (GC) or steam-flaked corn (FC), with CiP replacing each corn type at 4 levels (0, 25, 50, and 75\% of DM). All diets contained 12\% sugarcane bagasse and 88\% concentrate (DM basis). Treatments were also evaluated in metabolism trials, in which 10 ruminally cannulated Nellore steers (389 +/- 37 kg) were assigned to 2 independent but simultaneous 5 x 5 Latin squares, each using 1 method of corn processing (GC and FC). Interactions (P < 0.05) between corn processing and CiP inclusion level were observed for final BW, DMI, ADG, G:F, and HCW. With FC-based diets, added CiP linearly decreased final BW (P = 0.04), whereas with GC-based diets, added CiP quadratically increased final BW (P = 0.002). With FC-based diets, the inclusion of CiP linearly increased DMI (P = 0.03) and linearly decreased ADG (P = 0.03) and G: F (P = 0.001). Increasing CiP in GC-based diets quadratically increased DMI (P = 0.001), ADG (P = 0.005), and HCW (P = 0.003). In FC-based diets, CiP inclusion had no effect on HCW (P = 0.21). Dressing percent, LM area, and 12th-rib fat were not affected by diet (P = 0.05). For steers fed GC diets, CiP inclusion in the diet quadratically decreased the molar proportion of isovalerate (P = 0.001) but linearly increased ruminal butyrate (P = 0.006). No differences (P >= 0.16) were observed for total VFA concentrations, acetate: propionate ratio, and ruminal NH3-N as CiP replaced GC. For steers fed FC diets, the molar proportion of acetate linearly increased (P = 0.002) whereas the proportion of propionate was linearly decreased (P < 0.001), resulting in a linear increase (P = 0.001) in the acetate: propionate ratio. Replacing corn with CiP linearly reduced NEm (P = 0.001) and NEg (P < 0.001) of FC-based diets but did not affect (P = 0.15) NE values of CG-based diets. Steam flaking flint corn improved cattle performance in this trial more than has been reported for dent corn in the published literature.