Background: In the contemporary day world of nursing internal communication is paying attention on motivating nurses, managing the current changing in work environment that increase nurses engagement. Aim: Present study aim to assess the effect of internal communication on engagement among staff nurses at Ophthalmology Center, Mansoura University. Methods: The study was carrying out at Ophthalmology Center, Mansoura University. The subject of the present study was included all available staff nurses during data collection (n=89). Two tools were used in this study first tool: Communication Climate Survey Instrument and the second tool: Employee Engagement Survey Instrument. Results: the main finding indicated that there was statistically positive correlation between total score of internal communication and engagement as perceived by staff nurses. Also, statistically positive relation between the items of internal communication and items of nurses' engagement as perceived by staff nurses. Recommendations: Future additional study could be conduct on guide favorite to change and if it affects staff nurses' engagement and promote more networking and face-to-face communication by giving opportunity for nurses to work connectively to promote socialization.