The advancement of the Internet has enabled firms including micro, small and medium-sized enterprises (MSMEs) in Brunei Darussalam (Brunei) to adopt e-commerce. E-commerce has helped firms to easily buy and sell their products or services online. The advancement of the Internet and e-commerce has brought many benefits to the firms especially the MSMEs as it could help to reduce cost, enhance the firm's relationship with their customers and/or suppliers and increase business opportunities. To stay competitive, MSMEs must be aware of the potential benefits that e-commerce could bring. Moreover, before the firms have decided to adopt e-commerce, there are several factors that they should consider. This study aims to find out the factors that could affect the MSMEs' decision to adopt e-commerce by applying the technology-organizational-environmental (TOE) framework.