Abstract : New techniques to locally graft organic molecules on surfaces are presently developed for electronics, biology and chemical biology: electrochemical reaction on a locally modified surface, mask lithography, multi-step modification by a SECM. The scope of this work is to study the potential of the direct mode of the SECM and the AFM-SECM to induce a non conducting organic grafting (called electrografting) onto a conducting substrate. By combining the diazonium/vinylic monomers electrochemistry and the scanning electrochemical microscope tool in static or dynamic modes, we were able to pattern localized electrografted dots, lines or complex figures onto a gold substrate with a lateral resolution, which is about two times the size of the microelectrode. This resolution is completely comparable with that obtained with micro-contact printing methods and fully compatible with the actual requirements of many chemical and biological applications. The localization of the electrografting process is controlled by adjusting the tip-substrate distance, the current density, and the reaction time. The electrochemical grafting of different polymers onto conductive surfaces has also been studied. The resulting thin films were characterized by XPS, infrared, AFM analysis and optical microscopy.