Fifteen of New Zealand White rabbits that are 12 weeks old, weighing 2064 ± 31.78 g were used in this study. Rabbits were divided into five similar groups and housed in separate cages. The 1st pelleted experimental diet (R1) was used as a control; the supplemented citric acid was (0.5, 1.0, 1.5 and 2.0% of the R1diet for R2, R3, R4 and R5 diets, respectively). The nitrogen-free extract digestibility values were higher (p < 0.05) by feeding on R2 or R3 than feeding on R5 diet (83.21, 82.08 and 70.52%, respectively). However, the feeding on R1 or R2 showed the highest (p < 0.05) ratio of digestible energy intake to digestible crude protein intake (DEI/DCPI) (20.82 and 20.68, respectively). The villus height values were higher (P < 0.05) with feeding on R2, R3, R4 and R5 than feeding on R1 diet. Submucosa thickness was decreased (P < 0.05) with feeding R2 as opposed to feeding on the other diets. The feeding on R4 showed that there are some few aggregations of inflammatory cells in between the crypt, while feeding on R5 showing multifocal, mild inflammatory aggregations around single enterocyte damage. In conclusion, the current results showed that feeding on R1 or R2 were better for DEI/DCPI, villus height and the sub mucosa thickness. However, there is little knowledge on how citric acid affects rabbits, therefore further research is needed.