In this study, free vibration analysis of layered composite beams is performed by us-ing an analytical method based on trigonometric series. Based on the first-order shear deformation beam theory, the governing equations are derived from the La-grange’s equations. Appropriate trigonometric series functions are selected to satisfy the end conditions of the beam. Navier-type solution is used to obtain natural frequencies. Natural frequencies are calculated for different end conditions and lamina stacking. It was seen that the slenderness, E11/E22 and fiber angle have a significant effect on natural frequency. The results of the study are quite compatible with the literature.