Background: Healthy nutrition during pregnancy helps to maintain normal growth and development of the fetus, improve delivery outcomes and prevent childhood diseases later in life. Aim of this study: Was to evaluate the  effect of  instructional package on  pregnant women's  knowledge and attitude regarding healthy  nutrition. Design: A quasi experimental pre/ post- test one-group. Setting: This  study  was  conducted  in obstetrics  and  gynecological  outpatient  clinic at Benha university hospital. Sample: A Purposive sampling of 100pregnant woman Tools:A structured interviewing questionnaire , knowledge of studied  pregnant women regarding  healthy nutrition and attitude of studied pregnant women regarding  healthy nutrition Results: Total knowledge score regarding healthy nutrition were greatly improved after instructional package implementation than before implementation among studied  pregnant women. total attitude regarding healthy nutrition  were greatly improved after instructional package implementation than before implementation among studied  pregnant women. Conclusion: There was statistical significant correlation between total knowledge and total attitude among studied pregnant women pre instructional package implementation(P <0.05) .While there was a highly statistically significant correlation at  post instructional package implementation  (P ≤o,oo1 ). Therefore, the study hypothesis was supported. Recommendation: Posters and educational materials about healthy nutrition during pregnancy should be located in well-visible areas in outpatients' and private clinics.