A total of 180 nursery pigs (PIC 327 × 1050; 36 d of age; initially 16.1 kg) were utilized in a 35-d experiment to determine the effects of corn particle size and pelleting on nursery pig growth performance. All diets were nutritionally similar, but processing parameters created 4 experimental treatments in a 2 × 2 factorial with 2 corn particle sizes (500 µm vs. 750 µm) and 2 diet forms (mash vs. pelleted). Pigs were weaned on d 26 of age, blocked by initial BW, and fed a pelleted acclimation diet for 10 d. On d 0 of the experiment, pigs were randomly assigned to pens in a randomized complete block design with 5 pigs per pen and 9 replications per treatment. Experimental diets were fed in 2 phases: d 0 to 14 and d 14 to 35. Data were analyzed using the GLIMMIX procedure of SAS. Reducing particle size from 750 to 500 µm did not affect growth performance (P > 0.44). Pelleting reduced (P < 0.05) feed intake compared with feeding mash diets during each phase and overall, but did not affect ADG or G:F (P > 0.11). The interaction between particle size and diet form affected G:F from d 0 to 14, where finely ground mash diets or coarsely ground pelleted diets had greater feed efficiency than finely ground pelleted diets or coarsely ground mash diets (P = 0.04; 0.72, 0.68, 0.68, and 0.74 for 500 µm mash, 500 µm pelleted, 750 µm mash, and 750 µm pelleted diets, respectively). Additionally, the interaction tended to affect ADG from d 0 to 14 and overall where pigs fed finely ground mash diets had greater ADG than those fed finely ground pelleted diets (P = 0.06; 0.46 vs. 0.40 kg/d for d 0 to 14 and P = 0.10; 0.53 vs. 0.48 kg/d for d 0 to 35, respectively). However, this was offset by a tendency for the interaction to affect ADFI from d 14 to 35 as pigs fed finely ground mash diets had greater feed disappearance than those fed finely ground pelleted diets (P = 0.08; 1.18 vs. 1.08 kg/d, respectively). These findings are similar to recently published research in both nursery and finishing pigs that suggest there is little advantage of pelleting diets with a fine particle size.