This paper explores the efficiency of banks in 9 ASEAN countries including Brunei, Cambodia, Indonesia, Laos, Malaysia, Philippines, Singapore, Thailand and Vietnam in the period of 2013 2017 by using a non-participation approach. Input-oriented DEA method, with the inputs being Equity; Deposits; Loans and Operating expenses with one output are the Total operating income. The results show that the average overall efficiency of ASEAN banks in the study period is 59.2%, with this result, if the output is constant, the banks can save up to 40.8% of the first. into the business process. Among ASEAN countries in the research period, banks in Indonesia, Cambodia and Thailand are among the most effective with the efficiency of 0.746 0.745 and 0.605. Banks in Vietnam, Malaysia and Brunei had the lowest average efficiency during the study period with average efficiency of 0.514, 0.538 and 0.544.