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The present study seeks to determine the leading sectors of the Dumai City regional economy. This quantitative descriptive study used secondary data in the form of time series of the Gross Regional Domestic Product (GRDP) of Dumai City and Riau Province from 2010 to 2019. Location Quotient (LQ) for data analysis was used to determine the basic and non-basic industries in the economy of Dumai City as well as a shift-share analysis to determine changes and shifts in the economic structure of the Dumai City. The results of the sectoral analysis using the two analysis tools show that the leading sectors with competitive advantages and the basic sectorsof Dumai City is the sectors of Electricity and Gas Supply, Warehousing and Transportation, the Food, Beverage, and Accommodation, and the Information and Communication.