The use of Fourier Transformed Infrared Spectroscopy (FTIR) techniques for the nondestructive analysis of biological specimens is a rapidly expanding research area. In the present study, the volatile compounds of Thyme (Thymus numidicus Poiret.) collected from Azzaba, Skikda city (Algeria), were detected and identified by Fourier Transformed Infrared Spectroscopy analysis. FTIR allowed us to identify 10 volatile compounds and indicated than the functional groups and the presence vibrational modes of the essential oils are CHx deformation (1500-1400 cm^-1), C-H (Aromatic) (3150-3050 cm^-1) and Alcohol/Phenol O-H Stretch (3550-3200 cm^-1). The obtained results have shown that the essential oils can be fully utilized for pharmacy, cosmetology and industry.