The aim of this study was characterization of the epidemiological features of COVID 19 in Iran. METHODS: In this retrospective study, data related to the epidemiological characteristics of COVID 19 patients admitted to Baqiyatallah Hospital in Tehran, Iran, from 19 February 2020 to 15 April 2020 have been analyzed and reported. ...Diabetes, chronic respiratory diseases, hypertension, cardiovascular diseases, chronic Kidney diseases and cancer were the most common comorbidities with 3.81, 2.02 , 1.99 , 1.25, 0.60 and 0.57 , respectively. ...