Observing stellar activity from space

In this paper we present a review of the past, current and future space missions relevant for observing stellar activity from space. In the past, missions were focused on UV and X-ray fluxes, variability and spectroscopy. Currently coronal spectroscopy diagnostics are developed. HST high resolution imaging in the visible and near IR give access to circumstellar disks and outflows. The future space missions will concentrate on space photometry (for asteroseismology, exoplanets search and microvariability due to activity) and interferometry (for measuring stellar sizes and environments).