This dataset is a public OSF repository for the study Propagating Collective Spin-Valley Modes in Twisted WSe2. It contains research data organized by figure folders (Fig1 through Fig5), including text files associated with specific panels and measurements, such as delay-dependent dR/R data versus electric displacement field. The collection is intended to support the analysis, validation, and reproduction of results on collective spin-valley excitations and their propagation in twisted tungsten diselenide (WSe2), providing the underlying experimental data used to generate the figures for the project.