Network analysis is a very effective method which can be used in many different disciplines. It is possible to use network analysis in many areas of economics as well. Recently, input-output tables attracted economists who work in this area. Input-output tables give an important source of data for examining the productive significance of sectors since they reflect the intersectoral flows of intermediate goods. In this study, national input-output networks of selected nine countries which are in different levels of development and which have an important place in world trade are examined. This kind of an analysis may help us understand whether or not there is a connection between development levels and sectoral relationships.