The main focus of this article is to determine the adoption factors of Fintech based Mobile Financial Services (MFS) for the SMEs in Bangladesh. This study focused on four independent factors which are perceived organizational readiness, perceived security, facilitating conditions and government support along with behavioural intention to adopt Fintech based MFS as dependent factor. Five (5) point Likert Scale was used through questionnaire development to collect data form the owners and managers of the SMEs. PLS-SEM was used to analysed the collected data. The findings show significant affect of perceived organizational readiness and perceived security whereas facilitating conditions and government support was found not significant for determining behavioural intention to adopt Fintech based MFS. The outcome of this study would be helpful for Fintech studies on SMEs as well as policy makers.