Introduction: A frequent childhood condition called protein-energy malnutrition is largely brought on by a lack of energy, protein, and micronutrients. This study is designed to measure effective of the self-learning module for the knowledge of nurses concerning protein energy malnutrition for children in Mosul teaching hospitals

Methodology: Pre-experimental pretest with a posttest of one-group study design was applied at Ibn Al-Atheer Teaching Hospital inside Mosul City from 1st of June / 2021 to 2ed of January / 2022. The sample was chosen using a not-randomly purposive sample that contains (60) nurses.

A preliminary study was conducted on selected (10) nurses for 2 days, the period from 18-17 March 2021. The program booklet and questionnaire were created and made available to nurses. This is divided into two parts. The initial part deals with socio-demographic data, while the second component is broken up into six parts, each including five multiple-choice questions. A panel of 11 professionals from various areas evaluated the program booklet and questionnaire to determine its validity. The pilot research was conducted to assess the questionnaire's dependability. During the period from 1st to 4 / August / 2021. It included (10) nurses that non- probability selected. Using the Cronbach's Alpha test, the result (0. 791) using SPSS version 25.

Results: The study sample was female gender that 66.7% (40) of the sample at age (23-25). The total nurses’ knowledge was 56.7% (34) at a failure level in the pre-test but 43.3% (26) of the post-test at good level. The results of both tests showed a significant difference; the mean was (1.833), the standard deviation (0.905), the t-test (-15.690), and the p-value (0.000) were all significant. Age and gender were the only socio-demographic factors with which total knowledge in the pre-test the post-test significantly differed, but no other socio-demographic factors were significantly different. At p<0.05 value.

Recommendations: Another study regarding protein energy malnutrition should be done for the nursing staff by other researchers.