Abstract: To study the effects of adding date pits meal supplemented with beta-mannanase into diets on the productive performance and eggshell quality parameters, a total of 324 Hisex layer hens were randomly divided into 81 cages. Nine iso-energetic and iso-nitrogenous experimental diets in a 3 x 3 factorial arrangement including three levels of date pits meal (0, 5 and 10%) supplemented with three levels (0 or 330, 660 g of beta-mannanase/ton feed). Each dietary treatment was fed to 9 cages (4 birds/cage) for 8 weeks trail period after production peak from 45 to 53 weeks of age. Results showed significant (p<0.05) differences among treatments in feed consumption, feed conversion ratio, egg mass, egg production, eggshell weight, eggshell weight percentage, eggshell thickness and eggshell weight per surface area. It can be concluded that date pits meal could be partly added into diets as alternative feedstuffs up to 10% with supplementation of 660 g beta-mannanase/ton feed supplementation individually without negative effects on productive performance and eggshell quality characteristics of Hisex layer hen from 45 to 53 weeks of age. Further research on the effects of adding different levels of date pits meal supplemented with different levels of beta-mannanase at different ages on productive performance and eggshell quality parameters for layer hens are required to attain the optimal results.