Objectives: To determine the frequency & severity of liver involvement in dengue infection among adults at tertiary care hospital. Period: Six months (9th May 2016 to 9th Nov 2016). Study Design:  Cross-sectional study. Setting: Department of Gastroenterology and Department of Medicine Liaquat National Hospital, Karachi. Patients and Methods: Results: A total of 343 patients with Dengue fever were selected to conduct this study with mean age of 34.67±9.09 years. Mean duration of the fever was 7.31±1.62 days. Mean duration of hospital stay of the patients came out to be 3.50+0.82 days. Severity of liver enzymes derangement was mild in 80 patients (23%), moderate in 246 (72%) & severe in 17(5%). Mortality was seen in 14% (47 patients) & 100% mortality was seen in dengue fever patients with severely deranged Liver enzymes. Conclusion: Dengue fever patients with deranged liver enzymes had statistically worse outcome thus can lead to early recognition of high risk cases.