Composition of the volatile oils of the C. bigaradia, C. limon and C. delicosa have been investigated. The plant materials (leaves) were collected in spring 2000 from Corta (The medicinal plants garden) near Tonecabon, North of Iran. The oils were collected by means of hydrodistilation procedure. The yields were 1.4% v/w, 1.1 % v/w and 1% v/w respectively. Subesequently the oils were analyzed by gas chromatography mass spectrometry. The main constituents of C.bigaradia were linallol (38.72%), linalyl acetare (36.52%), α-terpineol (8.68%), of C. limon were geranial (31.45%), neral (23.16%), β-pinene (22.39%) and limonenc (6.7%) and of C. deliciosa were sabinene (37.64%), linallol (36.60%), δ-3-carene (4.42%) and citronellal (3.81%).