Do I need to apply for a visa to visit Sweden?

For visits up to 90 days
A Schengen visa is required for individuals of certain nationalities who wish to visit the Schengen countries for up to 90 days. A Schengen visa can be issued for a maximum of 90 days. U.S citizens and most citizens of North-, Central and South American countries do not need visas to visit Sweden if the visit is 90 days or less.

To find out if you need a visa to enter Sweden, please visit the Swedish government's website.

For visits longer than 90 days
Citizens of countries outside of the EU who want to visit Sweden for a period of more than 90 days are required to have a visitor's permit. Residence permits for visit can apply for a maximum period of up to one year, although they are usually restricted to six months.

Link to: Visa information