Background: Head injury is one of the emergency cases in surgery that is often found in the emergency. From year to year, cases of head injuries have significantly increased. High blood glucose levels in head-injured patients are thought to correlate with the level of consciousness, especially in patients with severe head injuries. The severe head injury affects the various complications that occur, which affects the length of stay (LOS) in the hospital. Objectives: To determine the correlation between hyperglycemia and length of stay in patients with severe head injuries. Methods: This study is an analytical observational study with a prospective design. The research sample included patients with severe head injuries who came to the surgical emergency unit at Prof. Dr. IGNG Ngoerah Hospital and met the inclusion criteria in medical record data throughout November 2019 – April 2020, with 56 samples. Results: The mean random blood sugar measurement results were found to be higher in the LOS ≥7 days group (210.14±83.93 mg/dL) compared to the LOS group7 days (165.88±92.44 mg/dL). Multivariate analysis using logistic regression found a significant relationship between mean hyperglycemia and LOS in patients with severe head injuries (OR 7.46; 95% CI [1.839-30.300]; P = 0.005) Conclusion: There is a significant correlation between mean hyperglycemia and the length of stay in patients with severe head injuries at Prof. Dr. IGNG Ngoerah Hospital.