Abstract Background Septic shock remains the leading cause of death in the intensive care unit (ICU), with an increasing incidence and a current mortality rate of approximately 30 %. Sepsis was defined by the presence of at least two criteria of systemic inflammatory response syndrome associated with a clinically or microbiologically documented, or a highly suspected infection. Severe sepsis was defined as a sepsis associated with at least one organ failure different from that responsible for the infection. Septic shock was defined as a severe sepsis associated with low blood pressure despite adequate vascular filling which required a vasopressor support. Cardiac dysfunction in sepsis is driven primarily by release of cytokines, mitochondrial dysfunction, and tissue hypoxia that leads to cardiac myocyte injury and death. Aim of the Work The aim of this study was to evaluate the effect of diastolic function on prognosis of septic shock in patients admitted to an intensive care unit (ICU). Patient and Methods This study was conducted on (50) patients with septic shock admitted to an intensive care unit (ICU) from November 2017 to November 2018. Results These patients was divided according to cardiac echocardiography findings into two groups:-Group 1:- 25 patients with preserved diastolic function and diastolic dysfunction grade I; 12 Male and 13 Female were included in the study, the average age was 43.44±13.69.Group 2:- Another 25 patients with diastolic dysfunction grade II and grade III; 11 Males and 14 Females were included in the study, the average age was 47.28±15.7. Conclusion We recommend assessment of patients admitted to the ICU with septic shock via echocardiography to determine the grade of diastolic dysfunction and using diastolic dysfunction as a predictive risk factor in various score assessment of ICU patients. Our study was limited by decreased sample size and we recommend further studies with increased sample size..