This study aimed at resolving the effect of social media marketing on buying intention from online fashion stores in Jordan. The target population is young Jordanian Facebook users between 18 and 35 years old reached 1501000 people (Department of Statistics, 2021).The non-probability sampling technique by Snowball Method. The recommended sample size was 386 which increased to 515. The quantitative method is the most appropriate of this study and is also part of descriptive research. The questionnaire is tool of collecting the primary data and the Five Points Likert Scale used. The questionnaire was designed via Google Drive and distributed to the target sample using whatsapp and other social platforms. The study concludes a positive direct relationship of the sub-independent variables: Usage, Online Rewards & Incentives, and Online Credibility with the buying intention from online fashion stores. The results indicate the variations effects of sub-variables on buying intention. There is no effect on usage, while rewards & incentives and online credibility are weakly affected the buying intention from e-fashion stores via Facebook.