Space projects on solar-terrestrial physics

The overview is given to present state of investigations in the field of solar-terrestrial physics realized by space agencies in different countries. We describe main results of active (Ulysses, SOHO, TRACE, RHESSI, Hinode, STEREO) and completed missions (Coronas-F and others), as well as scientific objectives for planned and prestarting space missions (SDO, Solar Probe, Solar Orbiter, Resonance, Interheliosonde and others). The space projects are considered in the context of scientific problems of the Sun-Earth system.