High-quality charge-transfer complex AgTCNQ nanowires have been successfully synthesized by a facile nanoelectro-chemical approach utilizing carbon nanotube (CNT) electrodes. These nanowires have diameters of 30-80 nm and lengths of up to several tens of micrometers, and exhibit remarkable electrical switching bistability. The uniform and high aspect ratio nature of nanowires originates from the one-dimensional structural feature and ultrasmall surface area of the CNTs.