The 9th Belgian-Dutch Gravitational Waves Meeting, which this time will be a virtual event, aims to bring together astronomers and physicists interested in gravitational wave science, to inform each other of recent developments and new projects. The meeting will start with a keynote lecture, followed by overview talks on general topics and experiments. In addition there will be contributed talks on specific projects, with preference given to students and postdocs. This meeting is open to all interested researchers, also from outside the Netherlands and Belgium.