Free vibration analysis of Au nanowires has been investigated. Au nanowire is modeled as a thin beam by using the continuum theory. Three-different cross-sections such as circular, rectangular and triangular are taken into consideration for ultra thin nanowires. Frequency values have been obtained for different geometric parameters and simply supported boundary condition (S-S). This study is helpful for design of the nanowires based instruments in modern Nanoelectromechanical systems (NEMS).