The purpose of this research is to figure out the leading sector in Lebak Regency. GRDP (Gross Regional Domestic Product) of Lebak Regency based on constant price in 2010 and GRDP of Banten Province based on constant price in 2010 in the period of 2013-2017 is the analysis that used in this research. The methods that are used, namely: Growth Ratio Model (MRP) Analysis, Shift-Share Analysis, Location Quotient (LQ) Analysis, Overlay Analysis, and Klassen Typology Analaysis. The sector that is classified in leading sector are Agriculture, Forestry, and Fisheries sector, Mining and Quarrying sector, Large and Retail Trade, Automobile and Motorcycle Repair sector, Provision and Accommodation and Meals sector, Mandatory Government, Defence, and Social Security Administration sector, Educational Services sector, Other Services sector.