en Healt care Management پژوهشي Original article <strong>Background:</strong> Hospitals are the largest and most costly operating units of health systems, and their share of current government expenditures in the healthcare sector is between 50 and 80 percent. The hospital efficiency is more indicative of the proper function of the resources devoted to it. The aim of this study was to evaluate the efficiency of hospitals in Tabriz by using the Pabon Lasso model.<br> <strong>Methods:</strong> This is a descriptive study that investigated the efficiency of Tabriz hospitals during 2009-2013. All hospitals of Tabriz were entered by census. Data (bed occupancy rate, bed turnover and patient length of stay) were collected in summer 2014 and charts were plotted using SPSS₁₉ software.<br> <strong>Results:</strong> The mean of Pabon Lasso&#39;s three indices of efficiency in 5 years (excluding psychiatric beds) was 67.6% for bed occupancy rate, 104.3 times bed turnover, and 2.48 days average patient length of stay. The coefficient of bed occupancy increased by 3% over 5 years, the bed turnover index increased by 8 times and the average length of stay decreased by 0.17 day. On average, 25.2% of hospitals were in Region 1, 23.5% in Region 2, 26.1% in Region 3 and 25.2% in Region 4 of Pabon Lasso Diagram.<br> <strong>Conclusion:</strong> The presence of 26% of hospitals in the region of Pabon Lasso Diagram shows the effective efficiency of hospitals which is not an acceptable statistics for hospitals and requires the intervention of health practitioners and policymakers. Pabon Lasso, Efficiency, Hospital 151 157 http://jebhpme.ssu.ac.ir/browse.php?a_code=A-10-26-20&slc_lang=en&sid=1 Javad Qodoosinejad No Social Determinants of Health Research Center, Birjand University of Medical Sciences, Birjand, Iran Amin Daemi No Health Economics Management Research Center, Isfahan University of Medical Sciences, Isfahan, Iran Mohammad Saadati No Department of Health Services Management, School of Health Management and Information Sciences, Iran University of Medical Sciences, Tehran, Iran Rouhollah Yaghoubi Yes School of Health Services Management, Baqiyatallah University of Medical Sciences, Tehran, Iran