This research aims to study Effect of Institutional Culture on the Professional Performance Level of Employees in Alexandria University Dormitories , This study was conducted on A simple random sample of  331 with10% of employees in Dormatories at Alexandria University, The data were collected by using a questionnaire through personal interview. The data were analyzed statistically using  Percentages, median, T test, analysis of variance and Pearson's simple correlation coefficient with computer program (SPSS V.22).The study revealed that:-
-Low percentage with good Level of Institutional Culture among 16.3%of participants.
-Low percentage with high Level of Professional Performance 19% of participants.
-There were statistically significant differences with sex (p < 0.05) between work philosophy , professional empowerment , and management creativity. while there are statistically significant differences with sex (p < 0.01)  between goal orientation , customer orientation , encourage creativity and innovation orientation, quality of work life, and continuous improvement management.
- There was a significant positive correlation (p < 0.05)between time management and  family size , while the relationship was a significant negative (p < 0.05) with the awareness level of institutional culture importance.
- There was a significant positive correlation between self-management and age, family size(p < 0.01), number of work years, marital life period, and the number of individuals working in family(p < 0.05), while it was negative significant(p < 0.05)between self-management and encourage creativity and innovation orientation, continuous improvement management and institutional culture level.
- There was a significant negative correlation (p < 0.01)between management creativity and dimension of encourage creativity and innovation orientation.
- There is a significant positive correlation (p < 0.05)between professional empowerment and awareness level with work philosophy and encourage creativity and innovation orientation, while there was a significant negative correlation between professional empowerment and family income (p < 0.01), family size,and marital life period p < 0.05).
- The results showed that family size affected self-management level 57% (p < 0.01) . while three independent variables affected level of professional empowerment (p < 0.01)which are family income (26%),  encourage creativity and innovation orientation (40%) and also awareness level with work philosophy (54%) .