The Rosetta Scientific Input Output library aims at providing easy reading and writing capabilities in Python for a wide range of scientific data formats. Thus providing an entry point to the wide ecosystem of python packages for scientific data analysis and computation, as well as an interoperability between different file formats. Just as the Rosetta stone provided a translation between ancient Egyptian hieroglyphs and ancient Greek. The RosettaSciIO library originates from the HyperSpy project for multi-dimensional data analysis. As HyperSpy is rooted in the electron microscopy community, data formats used by this community are still particularly well represented.