As per WHO data on global burden of diseases mental illnesses accounts for over 15 percent of the total burden of disease. Present study was planned to describe the common psychiatric disorders and various sociodemographic variables among patients attending psychiatry Out Patient Department (OPD) at a tertiary care psychiatric hospital of a northern state of India. This was a cross sectional record-based study. Psychiatric diagnosis was made according to International Classification of Diseases classification -10. In our study we analysed data of 358 patients who were first time registered in OPD of HHMH&R Shimla in last one year. We found that most of patients were in age group of 18-40 years of age (70.95%) and 73.2% patients were males. In our study we observed that 53.63% patients were single, 43.30% were married and 3.07% were separated. In our findings most of patients (27.93%) had no history of co-morbid substance abuse however most common co-morbid substance abuse was both cannabis and tobacco. Opioid use disorder was the most common psychiatric illness found in our study. Mental health disorders were found majorly in younger, unemployed males. While making mental health policies Government should take these findings in consideration.