Peels of Citrus as byproducts are considered a valuable source of various bioactive compounds such as essential oils and flavonoids with vital properties. So, the study goal is to determine which are the most suitable methods of extraction of the essential oils of three Citrus species peels C.aurantifolia (CA), C.limon (CL) and C.sinensis (CS). A comparative study of conventional techniques; hydrodistillation (HD), solvent extraction (SE), and innovative techniques; microwave-assisted extraction (MAE), ultrasound-assisted extraction (UAE), were used for extraction of the essential oils from the three Citrus species peels. The chemical composition with percentages of all constituents was determined using gas chromatography/mass spectroscopic analyses (GC/MS) of different oil peels. The GC/MS analyses results indicated that both HD and SE techniques were more desirable for the extraction, and they gave a higher percentage of monoterpene and sesquiterpene hydrocarbons (85.87% and 46.69%, respectively). These ingredients are considered the basic ingredients in many cosmetic and pharmaceutical industries. In contrast, MAE and UAE techniques were more efficient for extracting hydrocarbons, oxygenated monoterpenes, sesquiterpenes, oxygenated sesquiterpenes, and fatty acids from different essential oils peels. The results proved that the use of different extraction methods leads to different yields of essential oils with the highest yield with microwave-assisted extraction (MAE) techniques for three Citrus species peels (CA), (CL) and (CS) in percentages of 1.52 %, 2 %, 2.8 %, respectively.