Fibre metal laminates (FMLs) are advanced multilayered composite materials. In recent days, the demand of using these materials increased rapidly in aerospace, structural and automotive industries due to their high strength and lightweight attributes. These FMLs may be subjected to various vibratory loads and prone to damages during their working condition; in the present work, a numerical comparative study between Glass-Aluminium-reinforced Laminates (GLARE) and Carbon-Aluminium-reinforced Laminates (CARALL) with 5 mm, 10 mm, 15 mm, 20 mm length cracks and without cracks is conducted under free vibration analysis; the effect of boundary condition on natural frequency is also studied. From the results, it is clearly noticed that CARALL exhibited higher natural frequency values when compared to GLARE. It may be due to high strength and stiffness nature of the carbon fibre. It is also depicted that, as the crack length increases at the fixed position the natural frequency for different modes decreases, which may be due to decrease in stiffness of the FML.