Bell pepper is one of the most important vegetables in the world regarding its nutritional and economical values for human being. It is a warm season crop which is sensitive to low temperatures and when its seedlings exposed to low (non-freezing) temperatures, showes chilling injury. Low temperature is one of the important enviromental factors in agriculture that limits the survival, productivity and geographical distribution of plants in large areas of the world. Agricultural comodities specially horticultural crops suffer from different enviromental stresses such as cold temperatures which estimated annually to be milliards of dollars. Therefore, using different methods in order to make crops more tolerant to stresses is necessary. Among the Chemicals that their effects on reducing chilling injury has recently been studied are salicylates and jasmonates. Salicylic acid (SA), jasmonic acid (JA) and their methyl esters (MeSA, MeJA) are endogenous signal molecules that play essential roles in regulating stress responses and plant development. Since bell pepper is sensitive to low temperatures, a study in two separate experiments was carried out on two different cultivars of “Emily” (a greenhouse cv.) and “PS301 ” (a field cv.) to find out the effects of salicylic acid and methyl jasmonate on increasing the tolerance of bell pepper to chilling temperatures. Both trials were done as 7×2 factorial experiments in the completely randomized design (CRD) with four replications. The first factor contains salicylic acid in three concentrations of 0.1, 0.5 and 1mM and methyl jasmonate in the concentrations of 0.001, 0.01 and 0.1mM pluse control (distilled water) and the second factor was the method of application of hormone that involved spraying plants and soil drenching. Three days after application of hormones, plants moved to incubator in 0? centigrade under the photoperiods of 8 hours of light and 16 hours darkness. After 3 days, the seedlings were returned to greenhouse temperature in order to show visible symptoms of chilling injury. Three days later, visible chilling injury symptoms (necrotic lesions), chlorophyll fluorescence (Fv/Fm), chlorophyll content, relative water content (RWC) and electrolyte leakage were measured. To measure factors such as chlorophyll a and b, soluble suger, proline and starch later 0.1 gram of leaf samples were kept in a freezer of -70?C following soaking in liquid nitrogen. The results of both experiment showed that salicylic acid and methyl jasmonate treatment increased bell pepper plant tolerance to chilling stress compared to untreated plants. Salicylic acid was more effective than methyl jasmonate. Salicylic acid in the rate of 0.1mM in both cultivars for all measured parameters improved situation following chilling compared to untreated plants. .