Background: Gestational diabetes is defined as any degree of glucose intolerance with onset or first recognition during pregnancy; and it affects 11% of all pregnancies. Aim of this study is to : Evaluate the effect of educational programme for recently diagnosed Gestational Diabetic Women on their Knowledge and clinical outcome.Research Design: Quasi- experimental research design (One group pre-test, post-test).Subject: purposive sampleof (74) recruited pregnant women from Minia university hospital for maternity and child at antenatal care Department. Tools of data collection:three tools used as; self-administered Questionnaire,knowledge assessment,and clinical outcome assessment.Results:the majority of gestational diabetic women (93.2%, 97.3%) had good knowledge in immediate and Post 3 months respectively as compared in pre-educational program(23.0%) with highly statistically significance differences in which (P=0.000.);and there were highly statistically significance differences between pre and post educational program among gestational diabetes women regarding their clinical outcome random blood glucose and amniotic fluid amount in which (P=0.002, 0.001).Conclusion: study of educational programme is an effective method for improving women knowledge regarding gestational diabetes. Current study revealed that the gestational diabetic women had higher level of knowledge scores as well as improvement of clinical outcomes (random blood glucose and BMI) post-test significantly after education program as compared to their values at pretest.Recommendation: Providing educational program for recently diagnosed gestational diabetic women about proper management of GDM. Applying Counseling tips in gestational diabetic women discharge teaching plan to maintain healthy life style and maximum glycemic control prior to a future conception.