EU/EEA and Swiss citizens
You do not need a visa.
Non-EU/EEA citizens
New legislation came into force on 1 July 2008 which is based on the EU´s Researchers´ Visa Directive on which the National Agency for Higher Education can provide more information. The purpose is to make it easier for researchers outside the EU/EES to enter, remain and move freely within the area.
Down-load fact sheet from the Swedish Migration Board's website. Download the hosting agreement for visiting researchers.