June 10, 2020
The Belle II detector has recently started data-taking at the SuperKEKB $e^+e^-$ accelerator facility. The experiment is expected to collect around 50 times the dataset of Belle. Dark sector theories provide a particle explanation for dark matter without any direct coupling to Standard Model particles. Even very early Belle II data has good prospects for competitive dark sector searches. In these proceedings, three such searches for dark mediators are described.