The European Organisation for Astronomical Research in the Southern Hemisphere (ESO) is the foremost intergovernmental astronomy organisation in Europe and the world’s most productive astronomical observatory. ESO operates three unique world-class observing sites in the Atacama Desert region of Chile: La Silla, Paranal and Chajnantor. The ESO headquarters are located in Garching, near Munich, Germany. ESO is the focal point for Europe’s participation in the Atacama Large Millimeter Array (ALMA) consortium, which is currently constructing a large submillimetre array in the Chilean Andes. The concept and design of a 40m class European Extremely Large Telescope (E-ELT) is also currently underway at ESO.