Feverfew (Tanacetum parthenium) (TP) is a valuable medicinal plant from Asteraceae family with various pharmaceutical and therapeutic properties. To evaluate the effect of salicylic acid (SA) foliar application on the physiological and morphological responses of TP under salinity stress, a factorial experiment based on completely randomized design with three replicates under greenhouse conditions was conducted in Shiraz University, Iran. TP seedlings were fed with half strength Hoagland solution. Salinity was induced by NaCl and CaCl2 (2:1) at 30, 60, 90, 120, 150 and 180 mM concentrations. SA was applied at 0, 200 and 300 µM concentrations. Plant height, shoot number, fresh weight, dry weight, starch and essential oil (EO) content was measured. The essential oil content increased with increasing the salinity levels up to 120 mM; which was more significant when combined with SA application. All measured traits except for essential oils decreased when the salt level was increased.