In the current economic climate, online businesses are developing fast, with increasing responses from customers further encouraging online business. The use of IT enables wider opportunities for business expansionas well as presenting fresh challenges for businesses, whichhas led to many people deciding to venture into online business. When it comes to business success, the supplier plays an important role, and in choosing the right supplier, the overall performance of business operation can be immensely improved. Therefore, this paper aims to determine the factors that influence supplier selection for online sellers in Malaysia. In previous studies, the main focus proved to be research on supplier selection and the impacts of this on customer organisation and sales figures in physical stores, whereas this study will attempt to focus on online sellers; making the purpose of this study to identify and determine the factors that affect online business sellers in Malaysia in the selection of suppliers. Furthermore, this study attempts to use a combination of TPB and supplier selection criteria models to examine these factors. The increase of market globalisation and competition enabled by Internet-based technologies has contributed to significant changes in the order of stages in supplier selection factors, as well as introducing new criteria to the supplier selection process. As described above, gaps exist in previous research in this area, and there is an overall lack of research on this topic in Asian counties. Due to the lack of existing studies, this study contributes research by investigating the effects of quantity, quality, relationship, reliability, flexibility, delivery and cost on intention and their impacts on the behaviour of online sellers in Malaysia.It is hoped that this research will assist online sellers in selecting the correct supplier for their business, whilst reducing the overall costand enhancing business competency and clientservices.