This study aims to understand how the Online Single Submission (OSS) system is implemented at the Investment and One-Stop Integrated Services Office (DPMPTSP) of Jambi Province, and how it influences service accessibility, investment growth, and local economic development. OSS is a digital licensing system developed by the Indonesian government to simplify and accelerate the business licensing process through an integrated platform. This research uses a descriptive qualitative method, with data collected through interviews, observations, and documentation from DPMPTSP staff and business owners who use the OSS system. The results show that OSS helps simplify the licensing process and makes services more transparent. However, there are still challenges such as limited user understanding, uneven internet access, and weak inter-agency coordination. Despite these challenges, OSS is considered to have supported a more favorable investment climate and encouraged regional economic growth. Therefore, it is necessary to improve users' digital literacy, update the OSS system, and strengthen cooperation among related institutions.