Introduction: Sexual satisfaction is one of the important factors in marital satisfaction that affects couples' health and quality of life. The aim of this study was to determine sexual satisfaction and its related factors among married women in Shahroud, northeast of Iran. Methods: This cross-sectional study was conducted in 2017 and 500 married women were evaluated using Larson Sexual Satisfaction Questionnaire. The data were analyzed using chi-square, one-way ANOVA and a multiple regression model. Results: The mean age of the participants was 32.8 (SD= 8.7) years, and the length of the marriage was 11.05 (SD= 9.1). Among the participants, 4.4% (N=22) had low sexual satisfaction; 37.8% (N=189) had moderate satisfaction. The bivariate analysis showed significant relationships between sexual satisfaction and variables including age, husband's age, length of marriage, number of children, education, husband's education and income (p<0.001). The regression analysis also indicated significant relationships between sexual satisfaction and education (P=0.006), length of the marriage (P<0.001) and income (P=0.005). Conclusion: Socio-economic variables such as education and income are among the main factors related to sexual satisfaction. However, counseling couples on sexual issues after marriage can help improve their sexual satisfaction.