Background: Social support is an important factor in psycho-social well-being of cancer survivors. Thereis little information about level of social support and its predictors among cancer survivors in Iran or otherMiddle Eastern countries. The aims of present study were to determine the social support and its predictionfactors among Iranian cancer survivors. Materials and Methods: In this descriptive-correlational study 187cancer patients in one educational center and one private oncology office in northwest of Iran participated usinga convenient sampling method. The data collection tool consisted of a researcher-prepared checklist and theMultidimensional Scale of Perceived Social Support Assessment (MSPSS). Data analysis was performed usingSPSS statistical software with descriptive statistics and multiple linear regression analysis. Results: The totalscore of MSPSS was 68 from a possible score between 7 and 84. Participants believed that they received a highlevel of support from their family members and significant others. Multiple linear regression analysis showedthat single and depressed cancer survivors and participants with lower levels of physical activity believed thatthey received lower levels of social support. Conclusions: Iranian cancer survivors receive high levels of socialsupport and family members are the most important source of this support. In planning any supportive careprogram for Iranian cancer survivors this strength should be considered. Especially, single and depressed andpatients with lower levels of physical activity need more attention.